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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
ccd979bd MF |
2 | /* -*- mode: c; c-basic-offset: 8; -*- |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * dlmglue.c | |
6 | * | |
7 | * Code which implements an OCFS2 specific interface to our DLM. | |
8 | * | |
9 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. | |
ccd979bd MF |
10 | */ |
11 | ||
12 | #include <linux/types.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/highmem.h> | |
15 | #include <linux/mm.h> | |
ccd979bd MF |
16 | #include <linux/kthread.h> |
17 | #include <linux/pagemap.h> | |
18 | #include <linux/debugfs.h> | |
19 | #include <linux/seq_file.h> | |
8ddb7b00 | 20 | #include <linux/time.h> |
9e33d69f | 21 | #include <linux/quotaops.h> |
174cd4b1 | 22 | #include <linux/sched/signal.h> |
ccd979bd | 23 | |
ccd979bd MF |
24 | #define MLOG_MASK_PREFIX ML_DLM_GLUE |
25 | #include <cluster/masklog.h> | |
26 | ||
27 | #include "ocfs2.h" | |
d24fbcda | 28 | #include "ocfs2_lockingver.h" |
ccd979bd MF |
29 | |
30 | #include "alloc.h" | |
d680efe9 | 31 | #include "dcache.h" |
ccd979bd MF |
32 | #include "dlmglue.h" |
33 | #include "extent_map.h" | |
7f1a37e3 | 34 | #include "file.h" |
ccd979bd MF |
35 | #include "heartbeat.h" |
36 | #include "inode.h" | |
37 | #include "journal.h" | |
24ef1815 | 38 | #include "stackglue.h" |
ccd979bd MF |
39 | #include "slot_map.h" |
40 | #include "super.h" | |
41 | #include "uptodate.h" | |
9e33d69f | 42 | #include "quota.h" |
8dec98ed | 43 | #include "refcounttree.h" |
b8a7a3a6 | 44 | #include "acl.h" |
ccd979bd MF |
45 | |
46 | #include "buffer_head_io.h" | |
47 | ||
48 | struct ocfs2_mask_waiter { | |
49 | struct list_head mw_item; | |
50 | int mw_status; | |
51 | struct completion mw_complete; | |
52 | unsigned long mw_mask; | |
53 | unsigned long mw_goal; | |
8ddb7b00 | 54 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 | 55 | ktime_t mw_lock_start; |
8ddb7b00 | 56 | #endif |
ccd979bd MF |
57 | }; |
58 | ||
54a7e755 MF |
59 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); |
60 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); | |
cf8e06f1 | 61 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres); |
9e33d69f | 62 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres); |
ccd979bd | 63 | |
d680efe9 | 64 | /* |
cc567d89 | 65 | * Return value from ->downconvert_worker functions. |
d680efe9 | 66 | * |
b5e500e2 | 67 | * These control the precise actions of ocfs2_unblock_lock() |
d680efe9 MF |
68 | * and ocfs2_process_blocked_lock() |
69 | * | |
70 | */ | |
71 | enum ocfs2_unblock_action { | |
72 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ | |
73 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire | |
74 | * ->post_unlock callback */ | |
75 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire | |
76 | * ->post_unlock() callback. */ | |
77 | }; | |
78 | ||
79 | struct ocfs2_unblock_ctl { | |
80 | int requeue; | |
81 | enum ocfs2_unblock_action unblock_action; | |
82 | }; | |
83 | ||
cb25797d | 84 | /* Lockdep class keys */ |
1cff514a | 85 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
480bd564 | 86 | static struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES]; |
1cff514a | 87 | #endif |
cb25797d | 88 | |
810d5aeb MF |
89 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
90 | int new_level); | |
91 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); | |
92 | ||
cc567d89 MF |
93 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
94 | int blocking); | |
95 | ||
cc567d89 MF |
96 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
97 | int blocking); | |
d680efe9 MF |
98 | |
99 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
100 | struct ocfs2_lock_res *lockres); | |
ccd979bd | 101 | |
9e33d69f | 102 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres); |
6cb129f5 | 103 | |
8dec98ed TM |
104 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
105 | int new_level); | |
106 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
107 | int blocking); | |
108 | ||
6cb129f5 AB |
109 | #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) |
110 | ||
111 | /* This aids in debugging situations where a bad LVB might be involved. */ | |
112 | static void ocfs2_dump_meta_lvb_info(u64 level, | |
113 | const char *function, | |
114 | unsigned int line, | |
115 | struct ocfs2_lock_res *lockres) | |
116 | { | |
a641dc2a | 117 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
6cb129f5 AB |
118 | |
119 | mlog(level, "LVB information for %s (called from %s:%u):\n", | |
120 | lockres->l_name, function, line); | |
121 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", | |
122 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), | |
123 | be32_to_cpu(lvb->lvb_igeneration)); | |
124 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", | |
125 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), | |
126 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), | |
127 | be16_to_cpu(lvb->lvb_imode)); | |
128 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " | |
129 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), | |
130 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), | |
131 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), | |
132 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), | |
133 | be32_to_cpu(lvb->lvb_iattr)); | |
134 | } | |
135 | ||
136 | ||
f625c979 MF |
137 | /* |
138 | * OCFS2 Lock Resource Operations | |
139 | * | |
140 | * These fine tune the behavior of the generic dlmglue locking infrastructure. | |
0d5dc6c2 MF |
141 | * |
142 | * The most basic of lock types can point ->l_priv to their respective | |
143 | * struct ocfs2_super and allow the default actions to manage things. | |
144 | * | |
145 | * Right now, each lock type also needs to implement an init function, | |
146 | * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() | |
147 | * should be called when the lock is no longer needed (i.e., object | |
148 | * destruction time). | |
f625c979 | 149 | */ |
ccd979bd | 150 | struct ocfs2_lock_res_ops { |
54a7e755 MF |
151 | /* |
152 | * Translate an ocfs2_lock_res * into an ocfs2_super *. Define | |
153 | * this callback if ->l_priv is not an ocfs2_super pointer | |
154 | */ | |
155 | struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); | |
b5e500e2 | 156 | |
0d5dc6c2 | 157 | /* |
34d024f8 MF |
158 | * Optionally called in the downconvert thread after a |
159 | * successful downconvert. The lockres will not be referenced | |
160 | * after this callback is called, so it is safe to free | |
161 | * memory, etc. | |
0d5dc6c2 MF |
162 | * |
163 | * The exact semantics of when this is called are controlled | |
164 | * by ->downconvert_worker() | |
165 | */ | |
d680efe9 | 166 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
f625c979 | 167 | |
16d5b956 MF |
168 | /* |
169 | * Allow a lock type to add checks to determine whether it is | |
170 | * safe to downconvert a lock. Return 0 to re-queue the | |
171 | * downconvert at a later time, nonzero to continue. | |
172 | * | |
173 | * For most locks, the default checks that there are no | |
174 | * incompatible holders are sufficient. | |
175 | * | |
176 | * Called with the lockres spinlock held. | |
177 | */ | |
178 | int (*check_downconvert)(struct ocfs2_lock_res *, int); | |
179 | ||
5ef0d4ea MF |
180 | /* |
181 | * Allows a lock type to populate the lock value block. This | |
182 | * is called on downconvert, and when we drop a lock. | |
183 | * | |
184 | * Locks that want to use this should set LOCK_TYPE_USES_LVB | |
185 | * in the flags field. | |
186 | * | |
187 | * Called with the lockres spinlock held. | |
188 | */ | |
189 | void (*set_lvb)(struct ocfs2_lock_res *); | |
190 | ||
cc567d89 MF |
191 | /* |
192 | * Called from the downconvert thread when it is determined | |
193 | * that a lock will be downconverted. This is called without | |
194 | * any locks held so the function can do work that might | |
195 | * schedule (syncing out data, etc). | |
196 | * | |
197 | * This should return any one of the ocfs2_unblock_action | |
198 | * values, depending on what it wants the thread to do. | |
199 | */ | |
200 | int (*downconvert_worker)(struct ocfs2_lock_res *, int); | |
201 | ||
f625c979 MF |
202 | /* |
203 | * LOCK_TYPE_* flags which describe the specific requirements | |
204 | * of a lock type. Descriptions of each individual flag follow. | |
205 | */ | |
206 | int flags; | |
ccd979bd MF |
207 | }; |
208 | ||
f625c979 MF |
209 | /* |
210 | * Some locks want to "refresh" potentially stale data when a | |
211 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this | |
212 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the | |
213 | * individual lockres l_flags member from the ast function. It is | |
214 | * expected that the locking wrapper will clear the | |
215 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. | |
216 | */ | |
217 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 | |
218 | ||
b80fc012 | 219 | /* |
5ef0d4ea MF |
220 | * Indicate that a lock type makes use of the lock value block. The |
221 | * ->set_lvb lock type callback must be defined. | |
b80fc012 MF |
222 | */ |
223 | #define LOCK_TYPE_USES_LVB 0x2 | |
224 | ||
ccd979bd | 225 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
54a7e755 | 226 | .get_osb = ocfs2_get_inode_osb, |
f625c979 | 227 | .flags = 0, |
ccd979bd MF |
228 | }; |
229 | ||
e63aecb6 | 230 | static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = { |
54a7e755 | 231 | .get_osb = ocfs2_get_inode_osb, |
810d5aeb MF |
232 | .check_downconvert = ocfs2_check_meta_downconvert, |
233 | .set_lvb = ocfs2_set_meta_lvb, | |
f1f54068 | 234 | .downconvert_worker = ocfs2_data_convert_worker, |
b80fc012 | 235 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, |
ccd979bd MF |
236 | }; |
237 | ||
ccd979bd | 238 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
f625c979 | 239 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
ccd979bd MF |
240 | }; |
241 | ||
242 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { | |
f625c979 | 243 | .flags = 0, |
ccd979bd MF |
244 | }; |
245 | ||
6ca497a8 | 246 | static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = { |
247 | .flags = 0, | |
248 | }; | |
249 | ||
4882abeb GH |
250 | static struct ocfs2_lock_res_ops ocfs2_trim_fs_lops = { |
251 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, | |
252 | }; | |
253 | ||
83273932 SE |
254 | static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = { |
255 | .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, | |
256 | }; | |
257 | ||
d680efe9 | 258 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
54a7e755 | 259 | .get_osb = ocfs2_get_dentry_osb, |
d680efe9 | 260 | .post_unlock = ocfs2_dentry_post_unlock, |
cc567d89 | 261 | .downconvert_worker = ocfs2_dentry_convert_worker, |
f625c979 | 262 | .flags = 0, |
d680efe9 MF |
263 | }; |
264 | ||
50008630 TY |
265 | static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { |
266 | .get_osb = ocfs2_get_inode_osb, | |
267 | .flags = 0, | |
268 | }; | |
269 | ||
cf8e06f1 MF |
270 | static struct ocfs2_lock_res_ops ocfs2_flock_lops = { |
271 | .get_osb = ocfs2_get_file_osb, | |
272 | .flags = 0, | |
273 | }; | |
274 | ||
9e33d69f JK |
275 | static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = { |
276 | .set_lvb = ocfs2_set_qinfo_lvb, | |
277 | .get_osb = ocfs2_get_qinfo_osb, | |
278 | .flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB, | |
279 | }; | |
280 | ||
8dec98ed TM |
281 | static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = { |
282 | .check_downconvert = ocfs2_check_refcount_downconvert, | |
283 | .downconvert_worker = ocfs2_refcount_convert_worker, | |
284 | .flags = 0, | |
285 | }; | |
286 | ||
ccd979bd MF |
287 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
288 | { | |
289 | return lockres->l_type == OCFS2_LOCK_TYPE_META || | |
50008630 TY |
290 | lockres->l_type == OCFS2_LOCK_TYPE_RW || |
291 | lockres->l_type == OCFS2_LOCK_TYPE_OPEN; | |
ccd979bd MF |
292 | } |
293 | ||
c0e41338 | 294 | static inline struct ocfs2_lock_res *ocfs2_lksb_to_lock_res(struct ocfs2_dlm_lksb *lksb) |
a796d286 JB |
295 | { |
296 | return container_of(lksb, struct ocfs2_lock_res, l_lksb); | |
297 | } | |
298 | ||
ccd979bd MF |
299 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
300 | { | |
301 | BUG_ON(!ocfs2_is_inode_lock(lockres)); | |
302 | ||
303 | return (struct inode *) lockres->l_priv; | |
304 | } | |
305 | ||
d680efe9 MF |
306 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
307 | { | |
308 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); | |
309 | ||
310 | return (struct ocfs2_dentry_lock *)lockres->l_priv; | |
311 | } | |
312 | ||
9e33d69f JK |
313 | static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres) |
314 | { | |
315 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO); | |
316 | ||
317 | return (struct ocfs2_mem_dqinfo *)lockres->l_priv; | |
318 | } | |
319 | ||
8dec98ed TM |
320 | static inline struct ocfs2_refcount_tree * |
321 | ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res) | |
322 | { | |
323 | return container_of(res, struct ocfs2_refcount_tree, rf_lockres); | |
324 | } | |
325 | ||
54a7e755 MF |
326 | static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) |
327 | { | |
328 | if (lockres->l_ops->get_osb) | |
329 | return lockres->l_ops->get_osb(lockres); | |
330 | ||
331 | return (struct ocfs2_super *)lockres->l_priv; | |
332 | } | |
333 | ||
ccd979bd MF |
334 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
335 | struct ocfs2_lock_res *lockres, | |
336 | int level, | |
bd3e7610 | 337 | u32 dlm_flags); |
ccd979bd MF |
338 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
339 | int wanted); | |
cb25797d JK |
340 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, |
341 | struct ocfs2_lock_res *lockres, | |
342 | int level, unsigned long caller_ip); | |
343 | static inline void ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
344 | struct ocfs2_lock_res *lockres, | |
345 | int level) | |
346 | { | |
347 | __ocfs2_cluster_unlock(osb, lockres, level, _RET_IP_); | |
348 | } | |
349 | ||
ccd979bd MF |
350 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); |
351 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); | |
352 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); | |
353 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); | |
354 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
355 | struct ocfs2_lock_res *lockres); | |
356 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, | |
357 | int convert); | |
c74ff8bb SM |
358 | #define ocfs2_log_dlm_error(_func, _err, _lockres) do { \ |
359 | if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \ | |
360 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \ | |
361 | _err, _func, _lockres->l_name); \ | |
362 | else \ | |
363 | mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \ | |
364 | _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \ | |
365 | (unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \ | |
ccd979bd | 366 | } while (0) |
34d024f8 MF |
367 | static int ocfs2_downconvert_thread(void *arg); |
368 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, | |
369 | struct ocfs2_lock_res *lockres); | |
e63aecb6 | 370 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
371 | struct buffer_head **bh); |
372 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); | |
373 | static inline int ocfs2_highest_compat_lock_level(int level); | |
de551246 JB |
374 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
375 | int new_level); | |
cf8e06f1 MF |
376 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
377 | struct ocfs2_lock_res *lockres, | |
378 | int new_level, | |
de551246 JB |
379 | int lvb, |
380 | unsigned int generation); | |
cf8e06f1 MF |
381 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
382 | struct ocfs2_lock_res *lockres); | |
383 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
384 | struct ocfs2_lock_res *lockres); | |
385 | ||
ccd979bd | 386 | |
ccd979bd MF |
387 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
388 | u64 blkno, | |
389 | u32 generation, | |
390 | char *name) | |
391 | { | |
392 | int len; | |
393 | ||
ccd979bd MF |
394 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); |
395 | ||
b0697053 MF |
396 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
397 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, | |
398 | (long long)blkno, generation); | |
ccd979bd MF |
399 | |
400 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); | |
401 | ||
402 | mlog(0, "built lock resource with name: %s\n", name); | |
ccd979bd MF |
403 | } |
404 | ||
34af946a | 405 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
ccd979bd MF |
406 | |
407 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, | |
408 | struct ocfs2_dlm_debug *dlm_debug) | |
409 | { | |
410 | mlog(0, "Add tracking for lockres %s\n", res->l_name); | |
411 | ||
412 | spin_lock(&ocfs2_dlm_tracking_lock); | |
413 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); | |
414 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
415 | } | |
416 | ||
417 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) | |
418 | { | |
419 | spin_lock(&ocfs2_dlm_tracking_lock); | |
420 | if (!list_empty(&res->l_debug_list)) | |
421 | list_del_init(&res->l_debug_list); | |
422 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
423 | } | |
424 | ||
8ddb7b00 SM |
425 | #ifdef CONFIG_OCFS2_FS_STATS |
426 | static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
427 | { | |
8ddb7b00 | 428 | res->l_lock_refresh = 0; |
5da844a2 | 429 | res->l_lock_wait = 0; |
5bc970e8 SM |
430 | memset(&res->l_lock_prmode, 0, sizeof(struct ocfs2_lock_stats)); |
431 | memset(&res->l_lock_exmode, 0, sizeof(struct ocfs2_lock_stats)); | |
8ddb7b00 SM |
432 | } |
433 | ||
434 | static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level, | |
435 | struct ocfs2_mask_waiter *mw, int ret) | |
436 | { | |
5bc970e8 SM |
437 | u32 usec; |
438 | ktime_t kt; | |
439 | struct ocfs2_lock_stats *stats; | |
440 | ||
441 | if (level == LKM_PRMODE) | |
442 | stats = &res->l_lock_prmode; | |
443 | else if (level == LKM_EXMODE) | |
444 | stats = &res->l_lock_exmode; | |
445 | else | |
8ddb7b00 SM |
446 | return; |
447 | ||
5bc970e8 SM |
448 | kt = ktime_sub(ktime_get(), mw->mw_lock_start); |
449 | usec = ktime_to_us(kt); | |
450 | ||
451 | stats->ls_gets++; | |
452 | stats->ls_total += ktime_to_ns(kt); | |
453 | /* overflow */ | |
16865b7c | 454 | if (unlikely(stats->ls_gets == 0)) { |
5bc970e8 SM |
455 | stats->ls_gets++; |
456 | stats->ls_total = ktime_to_ns(kt); | |
457 | } | |
458 | ||
459 | if (stats->ls_max < usec) | |
460 | stats->ls_max = usec; | |
461 | ||
8ddb7b00 | 462 | if (ret) |
5bc970e8 | 463 | stats->ls_fail++; |
8a7f5f4c GH |
464 | |
465 | stats->ls_last = ktime_to_us(ktime_get_real()); | |
8ddb7b00 SM |
466 | } |
467 | ||
468 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
469 | { | |
470 | lockres->l_lock_refresh++; | |
471 | } | |
472 | ||
5da844a2 GH |
473 | static inline void ocfs2_track_lock_wait(struct ocfs2_lock_res *lockres) |
474 | { | |
475 | struct ocfs2_mask_waiter *mw; | |
476 | ||
477 | if (list_empty(&lockres->l_mask_waiters)) { | |
478 | lockres->l_lock_wait = 0; | |
479 | return; | |
480 | } | |
481 | ||
482 | mw = list_first_entry(&lockres->l_mask_waiters, | |
483 | struct ocfs2_mask_waiter, mw_item); | |
484 | lockres->l_lock_wait = | |
485 | ktime_to_us(ktime_mono_to_real(mw->mw_lock_start)); | |
486 | } | |
487 | ||
8ddb7b00 SM |
488 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) |
489 | { | |
5bc970e8 | 490 | mw->mw_lock_start = ktime_get(); |
8ddb7b00 SM |
491 | } |
492 | #else | |
493 | static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res) | |
494 | { | |
495 | } | |
496 | static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, | |
497 | int level, struct ocfs2_mask_waiter *mw, int ret) | |
498 | { | |
499 | } | |
500 | static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres) | |
501 | { | |
502 | } | |
5da844a2 GH |
503 | static inline void ocfs2_track_lock_wait(struct ocfs2_lock_res *lockres) |
504 | { | |
505 | } | |
8ddb7b00 SM |
506 | static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw) |
507 | { | |
508 | } | |
509 | #endif | |
510 | ||
ccd979bd MF |
511 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, |
512 | struct ocfs2_lock_res *res, | |
513 | enum ocfs2_lock_type type, | |
ccd979bd MF |
514 | struct ocfs2_lock_res_ops *ops, |
515 | void *priv) | |
516 | { | |
ccd979bd MF |
517 | res->l_type = type; |
518 | res->l_ops = ops; | |
519 | res->l_priv = priv; | |
520 | ||
bd3e7610 JB |
521 | res->l_level = DLM_LOCK_IV; |
522 | res->l_requested = DLM_LOCK_IV; | |
523 | res->l_blocking = DLM_LOCK_IV; | |
ccd979bd MF |
524 | res->l_action = OCFS2_AST_INVALID; |
525 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
526 | ||
527 | res->l_flags = OCFS2_LOCK_INITIALIZED; | |
528 | ||
529 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); | |
8ddb7b00 SM |
530 | |
531 | ocfs2_init_lock_stats(res); | |
cb25797d JK |
532 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
533 | if (type != OCFS2_LOCK_TYPE_OPEN) | |
534 | lockdep_init_map(&res->l_lockdep_map, ocfs2_lock_type_strings[type], | |
535 | &lockdep_keys[type], 0); | |
536 | else | |
537 | res->l_lockdep_map.key = NULL; | |
538 | #endif | |
ccd979bd MF |
539 | } |
540 | ||
541 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) | |
542 | { | |
543 | /* This also clears out the lock status block */ | |
544 | memset(res, 0, sizeof(struct ocfs2_lock_res)); | |
545 | spin_lock_init(&res->l_lock); | |
546 | init_waitqueue_head(&res->l_event); | |
547 | INIT_LIST_HEAD(&res->l_blocked_list); | |
548 | INIT_LIST_HEAD(&res->l_mask_waiters); | |
439a36b8 | 549 | INIT_LIST_HEAD(&res->l_holders); |
ccd979bd MF |
550 | } |
551 | ||
552 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, | |
553 | enum ocfs2_lock_type type, | |
24c19ef4 | 554 | unsigned int generation, |
ccd979bd MF |
555 | struct inode *inode) |
556 | { | |
557 | struct ocfs2_lock_res_ops *ops; | |
558 | ||
559 | switch(type) { | |
560 | case OCFS2_LOCK_TYPE_RW: | |
561 | ops = &ocfs2_inode_rw_lops; | |
562 | break; | |
563 | case OCFS2_LOCK_TYPE_META: | |
e63aecb6 | 564 | ops = &ocfs2_inode_inode_lops; |
ccd979bd | 565 | break; |
50008630 TY |
566 | case OCFS2_LOCK_TYPE_OPEN: |
567 | ops = &ocfs2_inode_open_lops; | |
568 | break; | |
ccd979bd MF |
569 | default: |
570 | mlog_bug_on_msg(1, "type: %d\n", type); | |
571 | ops = NULL; /* thanks, gcc */ | |
572 | break; | |
5b43d645 | 573 | } |
ccd979bd | 574 | |
d680efe9 | 575 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
24c19ef4 | 576 | generation, res->l_name); |
d680efe9 MF |
577 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
578 | } | |
579 | ||
54a7e755 MF |
580 | static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) |
581 | { | |
582 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
583 | ||
584 | return OCFS2_SB(inode->i_sb); | |
585 | } | |
586 | ||
9e33d69f JK |
587 | static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres) |
588 | { | |
589 | struct ocfs2_mem_dqinfo *info = lockres->l_priv; | |
590 | ||
591 | return OCFS2_SB(info->dqi_gi.dqi_sb); | |
592 | } | |
593 | ||
cf8e06f1 MF |
594 | static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres) |
595 | { | |
596 | struct ocfs2_file_private *fp = lockres->l_priv; | |
597 | ||
598 | return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb); | |
599 | } | |
600 | ||
d680efe9 MF |
601 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
602 | { | |
603 | __be64 inode_blkno_be; | |
604 | ||
605 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], | |
606 | sizeof(__be64)); | |
607 | ||
608 | return be64_to_cpu(inode_blkno_be); | |
609 | } | |
610 | ||
54a7e755 MF |
611 | static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) |
612 | { | |
613 | struct ocfs2_dentry_lock *dl = lockres->l_priv; | |
614 | ||
615 | return OCFS2_SB(dl->dl_inode->i_sb); | |
616 | } | |
617 | ||
d680efe9 MF |
618 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
619 | u64 parent, struct inode *inode) | |
620 | { | |
621 | int len; | |
622 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; | |
623 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); | |
624 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; | |
625 | ||
626 | ocfs2_lock_res_init_once(lockres); | |
627 | ||
628 | /* | |
629 | * Unfortunately, the standard lock naming scheme won't work | |
630 | * here because we have two 16 byte values to use. Instead, | |
631 | * we'll stuff the inode number as a binary value. We still | |
632 | * want error prints to show something without garbling the | |
633 | * display, so drop a null byte in there before the inode | |
634 | * number. A future version of OCFS2 will likely use all | |
635 | * binary lock names. The stringified names have been a | |
636 | * tremendous aid in debugging, but now that the debugfs | |
637 | * interface exists, we can mangle things there if need be. | |
638 | * | |
639 | * NOTE: We also drop the standard "pad" value (the total lock | |
640 | * name size stays the same though - the last part is all | |
641 | * zeros due to the memset in ocfs2_lock_res_init_once() | |
642 | */ | |
643 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, | |
644 | "%c%016llx", | |
645 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), | |
646 | (long long)parent); | |
647 | ||
648 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); | |
649 | ||
650 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, | |
651 | sizeof(__be64)); | |
652 | ||
653 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
654 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, | |
655 | dl); | |
ccd979bd MF |
656 | } |
657 | ||
658 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, | |
659 | struct ocfs2_super *osb) | |
660 | { | |
661 | /* Superblock lockres doesn't come from a slab so we call init | |
662 | * once on it manually. */ | |
663 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
664 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
665 | 0, res->l_name); | |
ccd979bd | 666 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
ccd979bd MF |
667 | &ocfs2_super_lops, osb); |
668 | } | |
669 | ||
670 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, | |
671 | struct ocfs2_super *osb) | |
672 | { | |
673 | /* Rename lockres doesn't come from a slab so we call init | |
674 | * once on it manually. */ | |
675 | ocfs2_lock_res_init_once(res); | |
d680efe9 MF |
676 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
677 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, | |
ccd979bd MF |
678 | &ocfs2_rename_lops, osb); |
679 | } | |
680 | ||
6ca497a8 | 681 | static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res, |
682 | struct ocfs2_super *osb) | |
683 | { | |
684 | /* nfs_sync lockres doesn't come from a slab so we call init | |
685 | * once on it manually. */ | |
686 | ocfs2_lock_res_init_once(res); | |
687 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name); | |
688 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC, | |
689 | &ocfs2_nfs_sync_lops, osb); | |
690 | } | |
691 | ||
4cd9973f JB |
692 | static void ocfs2_nfs_sync_lock_init(struct ocfs2_super *osb) |
693 | { | |
694 | ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb); | |
695 | init_rwsem(&osb->nfs_sync_rwlock); | |
696 | } | |
697 | ||
4882abeb GH |
698 | void ocfs2_trim_fs_lock_res_init(struct ocfs2_super *osb) |
699 | { | |
700 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
701 | ||
5500ab4e GH |
702 | /* Only one trimfs thread are allowed to work at the same time. */ |
703 | mutex_lock(&osb->obs_trim_fs_mutex); | |
704 | ||
4882abeb GH |
705 | ocfs2_lock_res_init_once(lockres); |
706 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_TRIM_FS, 0, 0, lockres->l_name); | |
707 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_TRIM_FS, | |
708 | &ocfs2_trim_fs_lops, osb); | |
709 | } | |
710 | ||
711 | void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb) | |
712 | { | |
713 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
714 | ||
715 | ocfs2_simple_drop_lockres(osb, lockres); | |
716 | ocfs2_lock_res_free(lockres); | |
5500ab4e GH |
717 | |
718 | mutex_unlock(&osb->obs_trim_fs_mutex); | |
4882abeb GH |
719 | } |
720 | ||
83273932 SE |
721 | static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res, |
722 | struct ocfs2_super *osb) | |
723 | { | |
83273932 SE |
724 | ocfs2_lock_res_init_once(res); |
725 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name); | |
726 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN, | |
727 | &ocfs2_orphan_scan_lops, osb); | |
83273932 SE |
728 | } |
729 | ||
cf8e06f1 MF |
730 | void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres, |
731 | struct ocfs2_file_private *fp) | |
732 | { | |
733 | struct inode *inode = fp->fp_file->f_mapping->host; | |
734 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
735 | ||
736 | ocfs2_lock_res_init_once(lockres); | |
737 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno, | |
738 | inode->i_generation, lockres->l_name); | |
739 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, | |
740 | OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops, | |
741 | fp); | |
742 | lockres->l_flags |= OCFS2_LOCK_NOCACHE; | |
743 | } | |
744 | ||
9e33d69f JK |
745 | void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres, |
746 | struct ocfs2_mem_dqinfo *info) | |
747 | { | |
748 | ocfs2_lock_res_init_once(lockres); | |
749 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type, | |
750 | 0, lockres->l_name); | |
751 | ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres, | |
752 | OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops, | |
753 | info); | |
754 | } | |
755 | ||
8dec98ed TM |
756 | void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres, |
757 | struct ocfs2_super *osb, u64 ref_blkno, | |
758 | unsigned int generation) | |
759 | { | |
760 | ocfs2_lock_res_init_once(lockres); | |
761 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno, | |
762 | generation, lockres->l_name); | |
763 | ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT, | |
764 | &ocfs2_refcount_block_lops, osb); | |
765 | } | |
766 | ||
ccd979bd MF |
767 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
768 | { | |
ccd979bd MF |
769 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) |
770 | return; | |
771 | ||
772 | ocfs2_remove_lockres_tracking(res); | |
773 | ||
774 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), | |
775 | "Lockres %s is on the blocked list\n", | |
776 | res->l_name); | |
777 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), | |
778 | "Lockres %s has mask waiters pending\n", | |
779 | res->l_name); | |
780 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), | |
781 | "Lockres %s is locked\n", | |
782 | res->l_name); | |
783 | mlog_bug_on_msg(res->l_ro_holders, | |
784 | "Lockres %s has %u ro holders\n", | |
785 | res->l_name, res->l_ro_holders); | |
786 | mlog_bug_on_msg(res->l_ex_holders, | |
787 | "Lockres %s has %u ex holders\n", | |
788 | res->l_name, res->l_ex_holders); | |
789 | ||
790 | /* Need to clear out the lock status block for the dlm */ | |
791 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); | |
792 | ||
793 | res->l_flags = 0UL; | |
ccd979bd MF |
794 | } |
795 | ||
439a36b8 ER |
796 | /* |
797 | * Keep a list of processes who have interest in a lockres. | |
798 | * Note: this is now only uesed for check recursive cluster locking. | |
799 | */ | |
800 | static inline void ocfs2_add_holder(struct ocfs2_lock_res *lockres, | |
801 | struct ocfs2_lock_holder *oh) | |
802 | { | |
803 | INIT_LIST_HEAD(&oh->oh_list); | |
804 | oh->oh_owner_pid = get_pid(task_pid(current)); | |
805 | ||
806 | spin_lock(&lockres->l_lock); | |
807 | list_add_tail(&oh->oh_list, &lockres->l_holders); | |
808 | spin_unlock(&lockres->l_lock); | |
809 | } | |
810 | ||
133b81f2 LC |
811 | static struct ocfs2_lock_holder * |
812 | ocfs2_pid_holder(struct ocfs2_lock_res *lockres, | |
813 | struct pid *pid) | |
439a36b8 ER |
814 | { |
815 | struct ocfs2_lock_holder *oh; | |
439a36b8 | 816 | |
439a36b8 | 817 | spin_lock(&lockres->l_lock); |
439a36b8 ER |
818 | list_for_each_entry(oh, &lockres->l_holders, oh_list) { |
819 | if (oh->oh_owner_pid == pid) { | |
820 | spin_unlock(&lockres->l_lock); | |
133b81f2 | 821 | return oh; |
439a36b8 ER |
822 | } |
823 | } | |
824 | spin_unlock(&lockres->l_lock); | |
133b81f2 LC |
825 | return NULL; |
826 | } | |
439a36b8 | 827 | |
133b81f2 LC |
828 | static inline void ocfs2_remove_holder(struct ocfs2_lock_res *lockres, |
829 | struct ocfs2_lock_holder *oh) | |
830 | { | |
831 | spin_lock(&lockres->l_lock); | |
832 | list_del(&oh->oh_list); | |
833 | spin_unlock(&lockres->l_lock); | |
834 | ||
835 | put_pid(oh->oh_owner_pid); | |
439a36b8 ER |
836 | } |
837 | ||
133b81f2 | 838 | |
ccd979bd MF |
839 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, |
840 | int level) | |
841 | { | |
ccd979bd MF |
842 | BUG_ON(!lockres); |
843 | ||
844 | switch(level) { | |
bd3e7610 | 845 | case DLM_LOCK_EX: |
ccd979bd MF |
846 | lockres->l_ex_holders++; |
847 | break; | |
bd3e7610 | 848 | case DLM_LOCK_PR: |
ccd979bd MF |
849 | lockres->l_ro_holders++; |
850 | break; | |
851 | default: | |
852 | BUG(); | |
853 | } | |
ccd979bd MF |
854 | } |
855 | ||
856 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, | |
857 | int level) | |
858 | { | |
ccd979bd MF |
859 | BUG_ON(!lockres); |
860 | ||
861 | switch(level) { | |
bd3e7610 | 862 | case DLM_LOCK_EX: |
ccd979bd MF |
863 | BUG_ON(!lockres->l_ex_holders); |
864 | lockres->l_ex_holders--; | |
865 | break; | |
bd3e7610 | 866 | case DLM_LOCK_PR: |
ccd979bd MF |
867 | BUG_ON(!lockres->l_ro_holders); |
868 | lockres->l_ro_holders--; | |
869 | break; | |
870 | default: | |
871 | BUG(); | |
872 | } | |
ccd979bd MF |
873 | } |
874 | ||
875 | /* WARNING: This function lives in a world where the only three lock | |
876 | * levels are EX, PR, and NL. It *will* have to be adjusted when more | |
877 | * lock types are added. */ | |
878 | static inline int ocfs2_highest_compat_lock_level(int level) | |
879 | { | |
bd3e7610 | 880 | int new_level = DLM_LOCK_EX; |
ccd979bd | 881 | |
bd3e7610 JB |
882 | if (level == DLM_LOCK_EX) |
883 | new_level = DLM_LOCK_NL; | |
884 | else if (level == DLM_LOCK_PR) | |
885 | new_level = DLM_LOCK_PR; | |
ccd979bd MF |
886 | return new_level; |
887 | } | |
888 | ||
889 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, | |
890 | unsigned long newflags) | |
891 | { | |
800deef3 | 892 | struct ocfs2_mask_waiter *mw, *tmp; |
ccd979bd MF |
893 | |
894 | assert_spin_locked(&lockres->l_lock); | |
895 | ||
896 | lockres->l_flags = newflags; | |
897 | ||
800deef3 | 898 | list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { |
ccd979bd MF |
899 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
900 | continue; | |
901 | ||
902 | list_del_init(&mw->mw_item); | |
903 | mw->mw_status = 0; | |
904 | complete(&mw->mw_complete); | |
5da844a2 | 905 | ocfs2_track_lock_wait(lockres); |
ccd979bd MF |
906 | } |
907 | } | |
908 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) | |
909 | { | |
910 | lockres_set_flags(lockres, lockres->l_flags | or); | |
911 | } | |
912 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, | |
913 | unsigned long clear) | |
914 | { | |
915 | lockres_set_flags(lockres, lockres->l_flags & ~clear); | |
916 | } | |
917 | ||
918 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) | |
919 | { | |
ccd979bd MF |
920 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
921 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
922 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
bd3e7610 | 923 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
924 | |
925 | lockres->l_level = lockres->l_requested; | |
926 | if (lockres->l_level <= | |
927 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { | |
bd3e7610 | 928 | lockres->l_blocking = DLM_LOCK_NL; |
ccd979bd MF |
929 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
930 | } | |
931 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
932 | } |
933 | ||
934 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) | |
935 | { | |
ccd979bd MF |
936 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
937 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); | |
938 | ||
939 | /* Convert from RO to EX doesn't really need anything as our | |
940 | * information is already up to data. Convert from NL to | |
941 | * *anything* however should mark ourselves as needing an | |
942 | * update */ | |
bd3e7610 | 943 | if (lockres->l_level == DLM_LOCK_NL && |
f625c979 | 944 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
ccd979bd MF |
945 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
946 | ||
947 | lockres->l_level = lockres->l_requested; | |
a1912826 SM |
948 | |
949 | /* | |
950 | * We set the OCFS2_LOCK_UPCONVERT_FINISHING flag before clearing | |
951 | * the OCFS2_LOCK_BUSY flag to prevent the dc thread from | |
952 | * downconverting the lock before the upconvert has fully completed. | |
d1e78238 X |
953 | * Do not prevent the dc thread from downconverting if NONBLOCK lock |
954 | * had already returned. | |
a1912826 | 955 | */ |
d1e78238 X |
956 | if (!(lockres->l_flags & OCFS2_LOCK_NONBLOCK_FINISHED)) |
957 | lockres_or_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); | |
958 | else | |
959 | lockres_clear_flags(lockres, OCFS2_LOCK_NONBLOCK_FINISHED); | |
a1912826 | 960 | |
ccd979bd | 961 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
ccd979bd MF |
962 | } |
963 | ||
964 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) | |
965 | { | |
3cf0c507 | 966 | BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); |
ccd979bd MF |
967 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
968 | ||
bd3e7610 | 969 | if (lockres->l_requested > DLM_LOCK_NL && |
f625c979 MF |
970 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
971 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
ccd979bd MF |
972 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
973 | ||
974 | lockres->l_level = lockres->l_requested; | |
975 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); | |
976 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
ccd979bd MF |
977 | } |
978 | ||
ccd979bd MF |
979 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
980 | int level) | |
981 | { | |
982 | int needs_downconvert = 0; | |
ccd979bd MF |
983 | |
984 | assert_spin_locked(&lockres->l_lock); | |
985 | ||
ccd979bd MF |
986 | if (level > lockres->l_blocking) { |
987 | /* only schedule a downconvert if we haven't already scheduled | |
988 | * one that goes low enough to satisfy the level we're | |
989 | * blocking. this also catches the case where we get | |
990 | * duplicate BASTs */ | |
991 | if (ocfs2_highest_compat_lock_level(level) < | |
992 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) | |
993 | needs_downconvert = 1; | |
994 | ||
995 | lockres->l_blocking = level; | |
996 | } | |
997 | ||
9b915181 SM |
998 | mlog(ML_BASTS, "lockres %s, block %d, level %d, l_block %d, dwn %d\n", |
999 | lockres->l_name, level, lockres->l_level, lockres->l_blocking, | |
1000 | needs_downconvert); | |
1001 | ||
0b94a909 WW |
1002 | if (needs_downconvert) |
1003 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
c1e8d35e | 1004 | mlog(0, "needs_downconvert = %d\n", needs_downconvert); |
ccd979bd MF |
1005 | return needs_downconvert; |
1006 | } | |
1007 | ||
de551246 JB |
1008 | /* |
1009 | * OCFS2_LOCK_PENDING and l_pending_gen. | |
1010 | * | |
1011 | * Why does OCFS2_LOCK_PENDING exist? To close a race between setting | |
1012 | * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock() | |
1013 | * for more details on the race. | |
1014 | * | |
1015 | * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces | |
1016 | * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock() | |
1017 | * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear | |
1018 | * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns, | |
1019 | * the caller is going to try to clear PENDING again. If nothing else is | |
1020 | * happening, __lockres_clear_pending() sees PENDING is unset and does | |
1021 | * nothing. | |
1022 | * | |
1023 | * But what if another path (eg downconvert thread) has just started a | |
1024 | * new locking action? The other path has re-set PENDING. Our path | |
1025 | * cannot clear PENDING, because that will re-open the original race | |
1026 | * window. | |
1027 | * | |
1028 | * [Example] | |
1029 | * | |
1030 | * ocfs2_meta_lock() | |
1031 | * ocfs2_cluster_lock() | |
1032 | * set BUSY | |
1033 | * set PENDING | |
1034 | * drop l_lock | |
1035 | * ocfs2_dlm_lock() | |
1036 | * ocfs2_locking_ast() ocfs2_downconvert_thread() | |
1037 | * clear PENDING ocfs2_unblock_lock() | |
1038 | * take_l_lock | |
1039 | * !BUSY | |
1040 | * ocfs2_prepare_downconvert() | |
1041 | * set BUSY | |
1042 | * set PENDING | |
1043 | * drop l_lock | |
1044 | * take l_lock | |
1045 | * clear PENDING | |
1046 | * drop l_lock | |
1047 | * <window> | |
1048 | * ocfs2_dlm_lock() | |
1049 | * | |
1050 | * So as you can see, we now have a window where l_lock is not held, | |
1051 | * PENDING is not set, and ocfs2_dlm_lock() has not been called. | |
1052 | * | |
1053 | * The core problem is that ocfs2_cluster_lock() has cleared the PENDING | |
1054 | * set by ocfs2_prepare_downconvert(). That wasn't nice. | |
1055 | * | |
1056 | * To solve this we introduce l_pending_gen. A call to | |
1057 | * lockres_clear_pending() will only do so when it is passed a generation | |
1058 | * number that matches the lockres. lockres_set_pending() will return the | |
1059 | * current generation number. When ocfs2_cluster_lock() goes to clear | |
1060 | * PENDING, it passes the generation it got from set_pending(). In our | |
1061 | * example above, the generation numbers will *not* match. Thus, | |
1062 | * ocfs2_cluster_lock() will not clear the PENDING set by | |
1063 | * ocfs2_prepare_downconvert(). | |
1064 | */ | |
1065 | ||
1066 | /* Unlocked version for ocfs2_locking_ast() */ | |
1067 | static void __lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1068 | unsigned int generation, | |
1069 | struct ocfs2_super *osb) | |
1070 | { | |
1071 | assert_spin_locked(&lockres->l_lock); | |
1072 | ||
1073 | /* | |
1074 | * The ast and locking functions can race us here. The winner | |
1075 | * will clear pending, the loser will not. | |
1076 | */ | |
1077 | if (!(lockres->l_flags & OCFS2_LOCK_PENDING) || | |
1078 | (lockres->l_pending_gen != generation)) | |
1079 | return; | |
1080 | ||
1081 | lockres_clear_flags(lockres, OCFS2_LOCK_PENDING); | |
1082 | lockres->l_pending_gen++; | |
1083 | ||
1084 | /* | |
1085 | * The downconvert thread may have skipped us because we | |
1086 | * were PENDING. Wake it up. | |
1087 | */ | |
1088 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1089 | ocfs2_wake_downconvert_thread(osb); | |
1090 | } | |
1091 | ||
1092 | /* Locked version for callers of ocfs2_dlm_lock() */ | |
1093 | static void lockres_clear_pending(struct ocfs2_lock_res *lockres, | |
1094 | unsigned int generation, | |
1095 | struct ocfs2_super *osb) | |
1096 | { | |
1097 | unsigned long flags; | |
1098 | ||
1099 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1100 | __lockres_clear_pending(lockres, generation, osb); | |
1101 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1102 | } | |
1103 | ||
1104 | static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres) | |
1105 | { | |
1106 | assert_spin_locked(&lockres->l_lock); | |
1107 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); | |
1108 | ||
1109 | lockres_or_flags(lockres, OCFS2_LOCK_PENDING); | |
1110 | ||
1111 | return lockres->l_pending_gen; | |
1112 | } | |
1113 | ||
c0e41338 | 1114 | static void ocfs2_blocking_ast(struct ocfs2_dlm_lksb *lksb, int level) |
ccd979bd | 1115 | { |
a796d286 | 1116 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
aa2623ad | 1117 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd MF |
1118 | int needs_downconvert; |
1119 | unsigned long flags; | |
1120 | ||
bd3e7610 | 1121 | BUG_ON(level <= DLM_LOCK_NL); |
ccd979bd | 1122 | |
9b915181 SM |
1123 | mlog(ML_BASTS, "BAST fired for lockres %s, blocking %d, level %d, " |
1124 | "type %s\n", lockres->l_name, level, lockres->l_level, | |
aa2623ad MF |
1125 | ocfs2_lock_type_string(lockres->l_type)); |
1126 | ||
cf8e06f1 MF |
1127 | /* |
1128 | * We can skip the bast for locks which don't enable caching - | |
1129 | * they'll be dropped at the earliest possible time anyway. | |
1130 | */ | |
1131 | if (lockres->l_flags & OCFS2_LOCK_NOCACHE) | |
1132 | return; | |
1133 | ||
ccd979bd MF |
1134 | spin_lock_irqsave(&lockres->l_lock, flags); |
1135 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); | |
1136 | if (needs_downconvert) | |
1137 | ocfs2_schedule_blocked_lock(osb, lockres); | |
1138 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1139 | ||
d680efe9 MF |
1140 | wake_up(&lockres->l_event); |
1141 | ||
34d024f8 | 1142 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
1143 | } |
1144 | ||
c0e41338 | 1145 | static void ocfs2_locking_ast(struct ocfs2_dlm_lksb *lksb) |
ccd979bd | 1146 | { |
a796d286 | 1147 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); |
de551246 | 1148 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); |
ccd979bd | 1149 | unsigned long flags; |
1693a5c0 | 1150 | int status; |
ccd979bd MF |
1151 | |
1152 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1153 | ||
1693a5c0 DT |
1154 | status = ocfs2_dlm_lock_status(&lockres->l_lksb); |
1155 | ||
1156 | if (status == -EAGAIN) { | |
1157 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1158 | goto out; | |
1159 | } | |
1160 | ||
1161 | if (status) { | |
8f2c9c1b | 1162 | mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n", |
1693a5c0 | 1163 | lockres->l_name, status); |
ccd979bd MF |
1164 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1165 | return; | |
1166 | } | |
1167 | ||
9b915181 SM |
1168 | mlog(ML_BASTS, "AST fired for lockres %s, action %d, unlock %d, " |
1169 | "level %d => %d\n", lockres->l_name, lockres->l_action, | |
1170 | lockres->l_unlock_action, lockres->l_level, lockres->l_requested); | |
1171 | ||
ccd979bd MF |
1172 | switch(lockres->l_action) { |
1173 | case OCFS2_AST_ATTACH: | |
1174 | ocfs2_generic_handle_attach_action(lockres); | |
e92d57df | 1175 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
ccd979bd MF |
1176 | break; |
1177 | case OCFS2_AST_CONVERT: | |
1178 | ocfs2_generic_handle_convert_action(lockres); | |
1179 | break; | |
1180 | case OCFS2_AST_DOWNCONVERT: | |
1181 | ocfs2_generic_handle_downconvert_action(lockres); | |
1182 | break; | |
1183 | default: | |
9b915181 SM |
1184 | mlog(ML_ERROR, "lockres %s: AST fired with invalid action: %u, " |
1185 | "flags 0x%lx, unlock: %u\n", | |
e92d57df MF |
1186 | lockres->l_name, lockres->l_action, lockres->l_flags, |
1187 | lockres->l_unlock_action); | |
ccd979bd MF |
1188 | BUG(); |
1189 | } | |
1693a5c0 | 1190 | out: |
ccd979bd MF |
1191 | /* set it to something invalid so if we get called again we |
1192 | * can catch it. */ | |
1193 | lockres->l_action = OCFS2_AST_INVALID; | |
ccd979bd | 1194 | |
de551246 JB |
1195 | /* Did we try to cancel this lock? Clear that state */ |
1196 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) | |
1197 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1198 | ||
1199 | /* | |
1200 | * We may have beaten the locking functions here. We certainly | |
1201 | * know that dlm_lock() has been called :-) | |
1202 | * Because we can't have two lock calls in flight at once, we | |
1203 | * can use lockres->l_pending_gen. | |
1204 | */ | |
1205 | __lockres_clear_pending(lockres, lockres->l_pending_gen, osb); | |
1206 | ||
ccd979bd | 1207 | wake_up(&lockres->l_event); |
d680efe9 | 1208 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
ccd979bd MF |
1209 | } |
1210 | ||
553b5eb9 JB |
1211 | static void ocfs2_unlock_ast(struct ocfs2_dlm_lksb *lksb, int error) |
1212 | { | |
1213 | struct ocfs2_lock_res *lockres = ocfs2_lksb_to_lock_res(lksb); | |
1214 | unsigned long flags; | |
1215 | ||
9b915181 SM |
1216 | mlog(ML_BASTS, "UNLOCK AST fired for lockres %s, action = %d\n", |
1217 | lockres->l_name, lockres->l_unlock_action); | |
553b5eb9 JB |
1218 | |
1219 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1220 | if (error) { | |
1221 | mlog(ML_ERROR, "Dlm passes error %d for lock %s, " | |
1222 | "unlock_action %d\n", error, lockres->l_name, | |
1223 | lockres->l_unlock_action); | |
1224 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1225 | return; |
1226 | } | |
1227 | ||
1228 | switch(lockres->l_unlock_action) { | |
1229 | case OCFS2_UNLOCK_CANCEL_CONVERT: | |
1230 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); | |
1231 | lockres->l_action = OCFS2_AST_INVALID; | |
1232 | /* Downconvert thread may have requeued this lock, we | |
1233 | * need to wake it. */ | |
1234 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
1235 | ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres)); | |
1236 | break; | |
1237 | case OCFS2_UNLOCK_DROP_LOCK: | |
1238 | lockres->l_level = DLM_LOCK_IV; | |
1239 | break; | |
1240 | default: | |
1241 | BUG(); | |
1242 | } | |
1243 | ||
1244 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
1245 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1246 | wake_up(&lockres->l_event); | |
1247 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
553b5eb9 JB |
1248 | } |
1249 | ||
1250 | /* | |
1251 | * This is the filesystem locking protocol. It provides the lock handling | |
1252 | * hooks for the underlying DLM. It has a maximum version number. | |
1253 | * The version number allows interoperability with systems running at | |
1254 | * the same major number and an equal or smaller minor number. | |
1255 | * | |
1256 | * Whenever the filesystem does new things with locks (adds or removes a | |
1257 | * lock, orders them differently, does different things underneath a lock), | |
1258 | * the version must be changed. The protocol is negotiated when joining | |
1259 | * the dlm domain. A node may join the domain if its major version is | |
1260 | * identical to all other nodes and its minor version is greater than | |
1261 | * or equal to all other nodes. When its minor version is greater than | |
1262 | * the other nodes, it will run at the minor version specified by the | |
1263 | * other nodes. | |
1264 | * | |
1265 | * If a locking change is made that will not be compatible with older | |
1266 | * versions, the major number must be increased and the minor version set | |
1267 | * to zero. If a change merely adds a behavior that can be disabled when | |
1268 | * speaking to older versions, the minor version must be increased. If a | |
1269 | * change adds a fully backwards compatible change (eg, LVB changes that | |
1270 | * are just ignored by older versions), the version does not need to be | |
1271 | * updated. | |
1272 | */ | |
1273 | static struct ocfs2_locking_protocol lproto = { | |
1274 | .lp_max_version = { | |
1275 | .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR, | |
1276 | .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR, | |
1277 | }, | |
1278 | .lp_lock_ast = ocfs2_locking_ast, | |
1279 | .lp_blocking_ast = ocfs2_blocking_ast, | |
1280 | .lp_unlock_ast = ocfs2_unlock_ast, | |
1281 | }; | |
1282 | ||
1283 | void ocfs2_set_locking_protocol(void) | |
1284 | { | |
1285 | ocfs2_stack_glue_set_max_proto_version(&lproto.lp_max_version); | |
1286 | } | |
1287 | ||
ccd979bd MF |
1288 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
1289 | int convert) | |
1290 | { | |
1291 | unsigned long flags; | |
1292 | ||
ccd979bd MF |
1293 | spin_lock_irqsave(&lockres->l_lock, flags); |
1294 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); | |
a1912826 | 1295 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
ccd979bd MF |
1296 | if (convert) |
1297 | lockres->l_action = OCFS2_AST_INVALID; | |
1298 | else | |
1299 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; | |
1300 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1301 | ||
1302 | wake_up(&lockres->l_event); | |
ccd979bd MF |
1303 | } |
1304 | ||
1305 | /* Note: If we detect another process working on the lock (i.e., | |
1306 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller | |
1307 | * to do the right thing in that case. | |
1308 | */ | |
1309 | static int ocfs2_lock_create(struct ocfs2_super *osb, | |
1310 | struct ocfs2_lock_res *lockres, | |
1311 | int level, | |
bd3e7610 | 1312 | u32 dlm_flags) |
ccd979bd MF |
1313 | { |
1314 | int ret = 0; | |
ccd979bd | 1315 | unsigned long flags; |
de551246 | 1316 | unsigned int gen; |
ccd979bd | 1317 | |
bd3e7610 | 1318 | mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level, |
ccd979bd MF |
1319 | dlm_flags); |
1320 | ||
1321 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1322 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || | |
1323 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { | |
1324 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1325 | goto bail; | |
1326 | } | |
1327 | ||
1328 | lockres->l_action = OCFS2_AST_ATTACH; | |
1329 | lockres->l_requested = level; | |
1330 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1331 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1332 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1333 | ||
4670c46d | 1334 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1335 | level, |
1336 | &lockres->l_lksb, | |
1337 | dlm_flags, | |
1338 | lockres->l_name, | |
a796d286 | 1339 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1340 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1341 | if (ret) { |
1342 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
1343 | ocfs2_recover_from_dlm_error(lockres, 1); |
1344 | } | |
1345 | ||
7431cd7e | 1346 | mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name); |
ccd979bd MF |
1347 | |
1348 | bail: | |
ccd979bd MF |
1349 | return ret; |
1350 | } | |
1351 | ||
1352 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, | |
1353 | int flag) | |
1354 | { | |
1355 | unsigned long flags; | |
1356 | int ret; | |
1357 | ||
1358 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1359 | ret = lockres->l_flags & flag; | |
1360 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1361 | ||
1362 | return ret; | |
1363 | } | |
1364 | ||
1365 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) | |
1366 | ||
1367 | { | |
1368 | wait_event(lockres->l_event, | |
1369 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); | |
1370 | } | |
1371 | ||
1372 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) | |
1373 | ||
1374 | { | |
1375 | wait_event(lockres->l_event, | |
1376 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); | |
1377 | } | |
1378 | ||
1379 | /* predict what lock level we'll be dropping down to on behalf | |
1380 | * of another node, and return true if the currently wanted | |
1381 | * level will be compatible with it. */ | |
1382 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, | |
1383 | int wanted) | |
1384 | { | |
1385 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); | |
1386 | ||
1387 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); | |
1388 | } | |
1389 | ||
1390 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) | |
1391 | { | |
1392 | INIT_LIST_HEAD(&mw->mw_item); | |
1393 | init_completion(&mw->mw_complete); | |
8ddb7b00 | 1394 | ocfs2_init_start_time(mw); |
ccd979bd MF |
1395 | } |
1396 | ||
1397 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) | |
1398 | { | |
1399 | wait_for_completion(&mw->mw_complete); | |
1400 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1401 | reinit_completion(&mw->mw_complete); |
ccd979bd MF |
1402 | return mw->mw_status; |
1403 | } | |
1404 | ||
1405 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, | |
1406 | struct ocfs2_mask_waiter *mw, | |
1407 | unsigned long mask, | |
1408 | unsigned long goal) | |
1409 | { | |
1410 | BUG_ON(!list_empty(&mw->mw_item)); | |
1411 | ||
1412 | assert_spin_locked(&lockres->l_lock); | |
1413 | ||
1414 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); | |
1415 | mw->mw_mask = mask; | |
1416 | mw->mw_goal = goal; | |
5da844a2 | 1417 | ocfs2_track_lock_wait(lockres); |
ccd979bd MF |
1418 | } |
1419 | ||
1420 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY | |
1421 | * if the mask still hadn't reached its goal */ | |
d1e78238 | 1422 | static int __lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
ccd979bd MF |
1423 | struct ocfs2_mask_waiter *mw) |
1424 | { | |
ccd979bd MF |
1425 | int ret = 0; |
1426 | ||
d1e78238 | 1427 | assert_spin_locked(&lockres->l_lock); |
ccd979bd MF |
1428 | if (!list_empty(&mw->mw_item)) { |
1429 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) | |
1430 | ret = -EBUSY; | |
1431 | ||
1432 | list_del_init(&mw->mw_item); | |
1433 | init_completion(&mw->mw_complete); | |
5da844a2 | 1434 | ocfs2_track_lock_wait(lockres); |
ccd979bd | 1435 | } |
d1e78238 X |
1436 | |
1437 | return ret; | |
1438 | } | |
1439 | ||
1440 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, | |
1441 | struct ocfs2_mask_waiter *mw) | |
1442 | { | |
1443 | unsigned long flags; | |
1444 | int ret = 0; | |
1445 | ||
1446 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1447 | ret = __lockres_remove_mask_waiter(lockres, mw); | |
ccd979bd MF |
1448 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1449 | ||
1450 | return ret; | |
1451 | ||
1452 | } | |
1453 | ||
cf8e06f1 MF |
1454 | static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw, |
1455 | struct ocfs2_lock_res *lockres) | |
1456 | { | |
1457 | int ret; | |
1458 | ||
1459 | ret = wait_for_completion_interruptible(&mw->mw_complete); | |
1460 | if (ret) | |
1461 | lockres_remove_mask_waiter(lockres, mw); | |
1462 | else | |
1463 | ret = mw->mw_status; | |
1464 | /* Re-arm the completion in case we want to wait on it again */ | |
16735d02 | 1465 | reinit_completion(&mw->mw_complete); |
cf8e06f1 MF |
1466 | return ret; |
1467 | } | |
1468 | ||
cb25797d JK |
1469 | static int __ocfs2_cluster_lock(struct ocfs2_super *osb, |
1470 | struct ocfs2_lock_res *lockres, | |
1471 | int level, | |
1472 | u32 lkm_flags, | |
1473 | int arg_flags, | |
1474 | int l_subclass, | |
1475 | unsigned long caller_ip) | |
ccd979bd MF |
1476 | { |
1477 | struct ocfs2_mask_waiter mw; | |
ccd979bd MF |
1478 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
1479 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ | |
1480 | unsigned long flags; | |
de551246 | 1481 | unsigned int gen; |
1693a5c0 | 1482 | int noqueue_attempted = 0; |
d1e78238 | 1483 | int dlm_locked = 0; |
b1b1e15e | 1484 | int kick_dc = 0; |
ccd979bd | 1485 | |
2f2eca20 | 1486 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) { |
1487 | mlog_errno(-EINVAL); | |
1488 | return -EINVAL; | |
1489 | } | |
1490 | ||
ccd979bd MF |
1491 | ocfs2_init_mask_waiter(&mw); |
1492 | ||
b80fc012 | 1493 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 1494 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 1495 | |
ccd979bd MF |
1496 | again: |
1497 | wait = 0; | |
1498 | ||
a1912826 SM |
1499 | spin_lock_irqsave(&lockres->l_lock, flags); |
1500 | ||
ccd979bd MF |
1501 | if (catch_signals && signal_pending(current)) { |
1502 | ret = -ERESTARTSYS; | |
a1912826 | 1503 | goto unlock; |
ccd979bd MF |
1504 | } |
1505 | ||
ccd979bd MF |
1506 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, |
1507 | "Cluster lock called on freeing lockres %s! flags " | |
1508 | "0x%lx\n", lockres->l_name, lockres->l_flags); | |
1509 | ||
1510 | /* We only compare against the currently granted level | |
1511 | * here. If the lock is blocked waiting on a downconvert, | |
1512 | * we'll get caught below. */ | |
1513 | if (lockres->l_flags & OCFS2_LOCK_BUSY && | |
1514 | level > lockres->l_level) { | |
1515 | /* is someone sitting in dlm_lock? If so, wait on | |
1516 | * them. */ | |
1517 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1518 | wait = 1; | |
1519 | goto unlock; | |
1520 | } | |
1521 | ||
a1912826 SM |
1522 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) { |
1523 | /* | |
1524 | * We've upconverted. If the lock now has a level we can | |
1525 | * work with, we take it. If, however, the lock is not at the | |
1526 | * required level, we go thru the full cycle. One way this could | |
1527 | * happen is if a process requesting an upconvert to PR is | |
1528 | * closely followed by another requesting upconvert to an EX. | |
1529 | * If the process requesting EX lands here, we want it to | |
1530 | * continue attempting to upconvert and let the process | |
1531 | * requesting PR take the lock. | |
1532 | * If multiple processes request upconvert to PR, the first one | |
1533 | * here will take the lock. The others will have to go thru the | |
1534 | * OCFS2_LOCK_BLOCKED check to ensure that there is no pending | |
1535 | * downconvert request. | |
1536 | */ | |
1537 | if (level <= lockres->l_level) | |
1538 | goto update_holders; | |
1539 | } | |
1540 | ||
ccd979bd MF |
1541 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
1542 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { | |
1543 | /* is the lock is currently blocked on behalf of | |
1544 | * another node */ | |
1545 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); | |
1546 | wait = 1; | |
1547 | goto unlock; | |
1548 | } | |
1549 | ||
1550 | if (level > lockres->l_level) { | |
1693a5c0 DT |
1551 | if (noqueue_attempted > 0) { |
1552 | ret = -EAGAIN; | |
1553 | goto unlock; | |
1554 | } | |
1555 | if (lkm_flags & DLM_LKF_NOQUEUE) | |
1556 | noqueue_attempted = 1; | |
1557 | ||
ccd979bd MF |
1558 | if (lockres->l_action != OCFS2_AST_INVALID) |
1559 | mlog(ML_ERROR, "lockres %s has action %u pending\n", | |
1560 | lockres->l_name, lockres->l_action); | |
1561 | ||
019d1b22 MF |
1562 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
1563 | lockres->l_action = OCFS2_AST_ATTACH; | |
bd3e7610 | 1564 | lkm_flags &= ~DLM_LKF_CONVERT; |
019d1b22 MF |
1565 | } else { |
1566 | lockres->l_action = OCFS2_AST_CONVERT; | |
bd3e7610 | 1567 | lkm_flags |= DLM_LKF_CONVERT; |
019d1b22 MF |
1568 | } |
1569 | ||
ccd979bd MF |
1570 | lockres->l_requested = level; |
1571 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 1572 | gen = lockres_set_pending(lockres); |
ccd979bd MF |
1573 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
1574 | ||
bd3e7610 JB |
1575 | BUG_ON(level == DLM_LOCK_IV); |
1576 | BUG_ON(level == DLM_LOCK_NL); | |
ccd979bd | 1577 | |
9b915181 | 1578 | mlog(ML_BASTS, "lockres %s, convert from %d to %d\n", |
ccd979bd MF |
1579 | lockres->l_name, lockres->l_level, level); |
1580 | ||
1581 | /* call dlm_lock to upgrade lock now */ | |
4670c46d | 1582 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
1583 | level, |
1584 | &lockres->l_lksb, | |
1585 | lkm_flags, | |
1586 | lockres->l_name, | |
a796d286 | 1587 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 1588 | lockres_clear_pending(lockres, gen, osb); |
7431cd7e JB |
1589 | if (ret) { |
1590 | if (!(lkm_flags & DLM_LKF_NOQUEUE) || | |
1591 | (ret != -EAGAIN)) { | |
24ef1815 | 1592 | ocfs2_log_dlm_error("ocfs2_dlm_lock", |
7431cd7e | 1593 | ret, lockres); |
ccd979bd MF |
1594 | } |
1595 | ocfs2_recover_from_dlm_error(lockres, 1); | |
1596 | goto out; | |
1597 | } | |
d1e78238 | 1598 | dlm_locked = 1; |
ccd979bd | 1599 | |
73ac36ea | 1600 | mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n", |
ccd979bd MF |
1601 | lockres->l_name); |
1602 | ||
1603 | /* At this point we've gone inside the dlm and need to | |
1604 | * complete our work regardless. */ | |
1605 | catch_signals = 0; | |
1606 | ||
1607 | /* wait for busy to clear and carry on */ | |
1608 | goto again; | |
1609 | } | |
1610 | ||
a1912826 | 1611 | update_holders: |
ccd979bd MF |
1612 | /* Ok, if we get here then we're good to go. */ |
1613 | ocfs2_inc_holders(lockres, level); | |
1614 | ||
1615 | ret = 0; | |
1616 | unlock: | |
a1912826 SM |
1617 | lockres_clear_flags(lockres, OCFS2_LOCK_UPCONVERT_FINISHING); |
1618 | ||
b1b1e15e TS |
1619 | /* ocfs2_unblock_lock reques on seeing OCFS2_LOCK_UPCONVERT_FINISHING */ |
1620 | kick_dc = (lockres->l_flags & OCFS2_LOCK_BLOCKED); | |
1621 | ||
ccd979bd | 1622 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
b1b1e15e TS |
1623 | if (kick_dc) |
1624 | ocfs2_wake_downconvert_thread(osb); | |
ccd979bd MF |
1625 | out: |
1626 | /* | |
1627 | * This is helping work around a lock inversion between the page lock | |
1628 | * and dlm locks. One path holds the page lock while calling aops | |
1629 | * which block acquiring dlm locks. The voting thread holds dlm | |
1630 | * locks while acquiring page locks while down converting data locks. | |
1631 | * This block is helping an aop path notice the inversion and back | |
1632 | * off to unlock its page lock before trying the dlm lock again. | |
1633 | */ | |
1634 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && | |
1635 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { | |
1636 | wait = 0; | |
d1e78238 X |
1637 | spin_lock_irqsave(&lockres->l_lock, flags); |
1638 | if (__lockres_remove_mask_waiter(lockres, &mw)) { | |
1639 | if (dlm_locked) | |
1640 | lockres_or_flags(lockres, | |
1641 | OCFS2_LOCK_NONBLOCK_FINISHED); | |
1642 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1643 | ret = -EAGAIN; |
d1e78238 X |
1644 | } else { |
1645 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
ccd979bd | 1646 | goto again; |
d1e78238 | 1647 | } |
ccd979bd MF |
1648 | } |
1649 | if (wait) { | |
1650 | ret = ocfs2_wait_for_mask(&mw); | |
1651 | if (ret == 0) | |
1652 | goto again; | |
1653 | mlog_errno(ret); | |
1654 | } | |
8ddb7b00 | 1655 | ocfs2_update_lock_stats(lockres, level, &mw, ret); |
ccd979bd | 1656 | |
cb25797d JK |
1657 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1658 | if (!ret && lockres->l_lockdep_map.key != NULL) { | |
1659 | if (level == DLM_LOCK_PR) | |
1660 | rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass, | |
1661 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1662 | caller_ip); | |
1663 | else | |
1664 | rwsem_acquire(&lockres->l_lockdep_map, l_subclass, | |
1665 | !!(arg_flags & OCFS2_META_LOCK_NOQUEUE), | |
1666 | caller_ip); | |
1667 | } | |
1668 | #endif | |
ccd979bd MF |
1669 | return ret; |
1670 | } | |
1671 | ||
cb25797d JK |
1672 | static inline int ocfs2_cluster_lock(struct ocfs2_super *osb, |
1673 | struct ocfs2_lock_res *lockres, | |
1674 | int level, | |
1675 | u32 lkm_flags, | |
1676 | int arg_flags) | |
1677 | { | |
1678 | return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags, | |
1679 | 0, _RET_IP_); | |
1680 | } | |
1681 | ||
1682 | ||
1683 | static void __ocfs2_cluster_unlock(struct ocfs2_super *osb, | |
1684 | struct ocfs2_lock_res *lockres, | |
1685 | int level, | |
1686 | unsigned long caller_ip) | |
ccd979bd MF |
1687 | { |
1688 | unsigned long flags; | |
1689 | ||
ccd979bd MF |
1690 | spin_lock_irqsave(&lockres->l_lock, flags); |
1691 | ocfs2_dec_holders(lockres, level); | |
34d024f8 | 1692 | ocfs2_downconvert_on_unlock(osb, lockres); |
ccd979bd | 1693 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
cb25797d JK |
1694 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1695 | if (lockres->l_lockdep_map.key != NULL) | |
5facae4f | 1696 | rwsem_release(&lockres->l_lockdep_map, caller_ip); |
cb25797d | 1697 | #endif |
ccd979bd MF |
1698 | } |
1699 | ||
da66116e AB |
1700 | static int ocfs2_create_new_lock(struct ocfs2_super *osb, |
1701 | struct ocfs2_lock_res *lockres, | |
1702 | int ex, | |
1703 | int local) | |
ccd979bd | 1704 | { |
bd3e7610 | 1705 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1706 | unsigned long flags; |
bd3e7610 | 1707 | u32 lkm_flags = local ? DLM_LKF_LOCAL : 0; |
ccd979bd MF |
1708 | |
1709 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1710 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); | |
1711 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); | |
1712 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1713 | ||
24c19ef4 | 1714 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
ccd979bd MF |
1715 | } |
1716 | ||
1717 | /* Grants us an EX lock on the data and metadata resources, skipping | |
1718 | * the normal cluster directory lookup. Use this ONLY on newly created | |
1719 | * inodes which other nodes can't possibly see, and which haven't been | |
1720 | * hashed in the inode hash yet. This can give us a good performance | |
1721 | * increase as it'll skip the network broadcast normally associated | |
1722 | * with creating a new lock resource. */ | |
1723 | int ocfs2_create_new_inode_locks(struct inode *inode) | |
1724 | { | |
1725 | int ret; | |
d680efe9 | 1726 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1727 | |
ccd979bd MF |
1728 | BUG_ON(!ocfs2_inode_is_new(inode)); |
1729 | ||
b0697053 | 1730 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
1731 | |
1732 | /* NOTE: That we don't increment any of the holder counts, nor | |
1733 | * do we add anything to a journal handle. Since this is | |
1734 | * supposed to be a new inode which the cluster doesn't know | |
1735 | * about yet, there is no need to. As far as the LVB handling | |
1736 | * is concerned, this is basically like acquiring an EX lock | |
1737 | * on a resource which has an invalid one -- we'll set it | |
1738 | * valid when we release the EX. */ | |
1739 | ||
24c19ef4 | 1740 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
ccd979bd MF |
1741 | if (ret) { |
1742 | mlog_errno(ret); | |
1743 | goto bail; | |
1744 | } | |
1745 | ||
24c19ef4 | 1746 | /* |
bd3e7610 | 1747 | * We don't want to use DLM_LKF_LOCAL on a meta data lock as they |
24c19ef4 MF |
1748 | * don't use a generation in their lock names. |
1749 | */ | |
e63aecb6 | 1750 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0); |
ccd979bd MF |
1751 | if (ret) { |
1752 | mlog_errno(ret); | |
1753 | goto bail; | |
1754 | } | |
1755 | ||
50008630 | 1756 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); |
a8f24f1b | 1757 | if (ret) |
50008630 | 1758 | mlog_errno(ret); |
50008630 | 1759 | |
ccd979bd | 1760 | bail: |
ccd979bd MF |
1761 | return ret; |
1762 | } | |
1763 | ||
1764 | int ocfs2_rw_lock(struct inode *inode, int write) | |
1765 | { | |
1766 | int status, level; | |
1767 | struct ocfs2_lock_res *lockres; | |
c271c5c2 | 1768 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1769 | |
b0697053 MF |
1770 | mlog(0, "inode %llu take %s RW lock\n", |
1771 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1772 | write ? "EXMODE" : "PRMODE"); |
1773 | ||
c1e8d35e | 1774 | if (ocfs2_mount_local(osb)) |
c271c5c2 SM |
1775 | return 0; |
1776 | ||
ccd979bd MF |
1777 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
1778 | ||
bd3e7610 | 1779 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1780 | |
1119d3c0 | 1781 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
ccd979bd MF |
1782 | if (status < 0) |
1783 | mlog_errno(status); | |
1784 | ||
ccd979bd MF |
1785 | return status; |
1786 | } | |
1787 | ||
06e7f13d GH |
1788 | int ocfs2_try_rw_lock(struct inode *inode, int write) |
1789 | { | |
1790 | int status, level; | |
1791 | struct ocfs2_lock_res *lockres; | |
1792 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1793 | ||
1794 | mlog(0, "inode %llu try to take %s RW lock\n", | |
1795 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1796 | write ? "EXMODE" : "PRMODE"); | |
1797 | ||
1798 | if (ocfs2_mount_local(osb)) | |
1799 | return 0; | |
1800 | ||
1801 | lockres = &OCFS2_I(inode)->ip_rw_lockres; | |
1802 | ||
1803 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; | |
1804 | ||
1805 | status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); | |
1806 | return status; | |
1807 | } | |
1808 | ||
ccd979bd MF |
1809 | void ocfs2_rw_unlock(struct inode *inode, int write) |
1810 | { | |
bd3e7610 | 1811 | int level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 1812 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
c271c5c2 | 1813 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 1814 | |
b0697053 MF |
1815 | mlog(0, "inode %llu drop %s RW lock\n", |
1816 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
1817 | write ? "EXMODE" : "PRMODE"); |
1818 | ||
c271c5c2 | 1819 | if (!ocfs2_mount_local(osb)) |
1119d3c0 | 1820 | ocfs2_cluster_unlock(osb, lockres, level); |
ccd979bd MF |
1821 | } |
1822 | ||
50008630 TY |
1823 | /* |
1824 | * ocfs2_open_lock always get PR mode lock. | |
1825 | */ | |
1826 | int ocfs2_open_lock(struct inode *inode) | |
1827 | { | |
1828 | int status = 0; | |
1829 | struct ocfs2_lock_res *lockres; | |
1830 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1831 | ||
50008630 TY |
1832 | mlog(0, "inode %llu take PRMODE open lock\n", |
1833 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1834 | ||
03efed8a | 1835 | if (ocfs2_is_hard_readonly(osb) || ocfs2_mount_local(osb)) |
50008630 TY |
1836 | goto out; |
1837 | ||
1838 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1839 | ||
1119d3c0 | 1840 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_PR, 0, 0); |
50008630 TY |
1841 | if (status < 0) |
1842 | mlog_errno(status); | |
1843 | ||
1844 | out: | |
50008630 TY |
1845 | return status; |
1846 | } | |
1847 | ||
1848 | int ocfs2_try_open_lock(struct inode *inode, int write) | |
1849 | { | |
1850 | int status = 0, level; | |
1851 | struct ocfs2_lock_res *lockres; | |
1852 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1853 | ||
50008630 TY |
1854 | mlog(0, "inode %llu try to take %s open lock\n", |
1855 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
1856 | write ? "EXMODE" : "PRMODE"); | |
1857 | ||
03efed8a TY |
1858 | if (ocfs2_is_hard_readonly(osb)) { |
1859 | if (write) | |
1860 | status = -EROFS; | |
1861 | goto out; | |
1862 | } | |
1863 | ||
50008630 TY |
1864 | if (ocfs2_mount_local(osb)) |
1865 | goto out; | |
1866 | ||
1867 | lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1868 | ||
bd3e7610 | 1869 | level = write ? DLM_LOCK_EX : DLM_LOCK_PR; |
50008630 TY |
1870 | |
1871 | /* | |
1872 | * The file system may already holding a PRMODE/EXMODE open lock. | |
bd3e7610 | 1873 | * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on |
50008630 TY |
1874 | * other nodes and the -EAGAIN will indicate to the caller that |
1875 | * this inode is still in use. | |
1876 | */ | |
1119d3c0 | 1877 | status = ocfs2_cluster_lock(osb, lockres, level, DLM_LKF_NOQUEUE, 0); |
50008630 TY |
1878 | |
1879 | out: | |
50008630 TY |
1880 | return status; |
1881 | } | |
1882 | ||
1883 | /* | |
1884 | * ocfs2_open_unlock unlock PR and EX mode open locks. | |
1885 | */ | |
1886 | void ocfs2_open_unlock(struct inode *inode) | |
1887 | { | |
1888 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; | |
1889 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
1890 | ||
50008630 TY |
1891 | mlog(0, "inode %llu drop open lock\n", |
1892 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
1893 | ||
1894 | if (ocfs2_mount_local(osb)) | |
1895 | goto out; | |
1896 | ||
1897 | if(lockres->l_ro_holders) | |
1119d3c0 | 1898 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_PR); |
50008630 | 1899 | if(lockres->l_ex_holders) |
1119d3c0 | 1900 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
50008630 TY |
1901 | |
1902 | out: | |
c1e8d35e | 1903 | return; |
50008630 TY |
1904 | } |
1905 | ||
cf8e06f1 MF |
1906 | static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres, |
1907 | int level) | |
1908 | { | |
1909 | int ret; | |
1910 | struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); | |
1911 | unsigned long flags; | |
1912 | struct ocfs2_mask_waiter mw; | |
1913 | ||
1914 | ocfs2_init_mask_waiter(&mw); | |
1915 | ||
1916 | retry_cancel: | |
1917 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1918 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
1919 | ret = ocfs2_prepare_cancel_convert(osb, lockres); | |
1920 | if (ret) { | |
1921 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1922 | ret = ocfs2_cancel_convert(osb, lockres); | |
1923 | if (ret < 0) { | |
1924 | mlog_errno(ret); | |
1925 | goto out; | |
1926 | } | |
1927 | goto retry_cancel; | |
1928 | } | |
1929 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1930 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1931 | ||
1932 | ocfs2_wait_for_mask(&mw); | |
1933 | goto retry_cancel; | |
1934 | } | |
1935 | ||
1936 | ret = -ERESTARTSYS; | |
1937 | /* | |
1938 | * We may still have gotten the lock, in which case there's no | |
1939 | * point to restarting the syscall. | |
1940 | */ | |
1941 | if (lockres->l_level == level) | |
1942 | ret = 0; | |
1943 | ||
1944 | mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret, | |
1945 | lockres->l_flags, lockres->l_level, lockres->l_action); | |
1946 | ||
1947 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1948 | ||
1949 | out: | |
1950 | return ret; | |
1951 | } | |
1952 | ||
1953 | /* | |
1954 | * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of | |
1955 | * flock() calls. The locking approach this requires is sufficiently | |
1956 | * different from all other cluster lock types that we implement a | |
3ad2f3fb | 1957 | * separate path to the "low-level" dlm calls. In particular: |
cf8e06f1 MF |
1958 | * |
1959 | * - No optimization of lock levels is done - we take at exactly | |
1960 | * what's been requested. | |
1961 | * | |
1962 | * - No lock caching is employed. We immediately downconvert to | |
1963 | * no-lock at unlock time. This also means flock locks never go on | |
1964 | * the blocking list). | |
1965 | * | |
1966 | * - Since userspace can trivially deadlock itself with flock, we make | |
1967 | * sure to allow cancellation of a misbehaving applications flock() | |
1968 | * request. | |
1969 | * | |
1970 | * - Access to any flock lockres doesn't require concurrency, so we | |
1971 | * can simplify the code by requiring the caller to guarantee | |
1972 | * serialization of dlmglue flock calls. | |
1973 | */ | |
1974 | int ocfs2_file_lock(struct file *file, int ex, int trylock) | |
1975 | { | |
e988cf1c MF |
1976 | int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
1977 | unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0; | |
cf8e06f1 MF |
1978 | unsigned long flags; |
1979 | struct ocfs2_file_private *fp = file->private_data; | |
1980 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
1981 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
1982 | struct ocfs2_mask_waiter mw; | |
1983 | ||
1984 | ocfs2_init_mask_waiter(&mw); | |
1985 | ||
1986 | if ((lockres->l_flags & OCFS2_LOCK_BUSY) || | |
bd3e7610 | 1987 | (lockres->l_level > DLM_LOCK_NL)) { |
cf8e06f1 MF |
1988 | mlog(ML_ERROR, |
1989 | "File lock \"%s\" has busy or locked state: flags: 0x%lx, " | |
1990 | "level: %u\n", lockres->l_name, lockres->l_flags, | |
1991 | lockres->l_level); | |
1992 | return -EINVAL; | |
1993 | } | |
1994 | ||
1995 | spin_lock_irqsave(&lockres->l_lock, flags); | |
1996 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
1997 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
1998 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
1999 | ||
2000 | /* | |
2001 | * Get the lock at NLMODE to start - that way we | |
2002 | * can cancel the upconvert request if need be. | |
2003 | */ | |
e988cf1c | 2004 | ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0); |
cf8e06f1 MF |
2005 | if (ret < 0) { |
2006 | mlog_errno(ret); | |
2007 | goto out; | |
2008 | } | |
2009 | ||
2010 | ret = ocfs2_wait_for_mask(&mw); | |
2011 | if (ret) { | |
2012 | mlog_errno(ret); | |
2013 | goto out; | |
2014 | } | |
2015 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2016 | } | |
2017 | ||
2018 | lockres->l_action = OCFS2_AST_CONVERT; | |
e988cf1c | 2019 | lkm_flags |= DLM_LKF_CONVERT; |
cf8e06f1 MF |
2020 | lockres->l_requested = level; |
2021 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
2022 | ||
2023 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); | |
2024 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2025 | ||
4670c46d | 2026 | ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags, |
a796d286 | 2027 | lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1); |
7431cd7e JB |
2028 | if (ret) { |
2029 | if (!trylock || (ret != -EAGAIN)) { | |
24ef1815 | 2030 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); |
cf8e06f1 MF |
2031 | ret = -EINVAL; |
2032 | } | |
2033 | ||
2034 | ocfs2_recover_from_dlm_error(lockres, 1); | |
2035 | lockres_remove_mask_waiter(lockres, &mw); | |
2036 | goto out; | |
2037 | } | |
2038 | ||
2039 | ret = ocfs2_wait_for_mask_interruptible(&mw, lockres); | |
2040 | if (ret == -ERESTARTSYS) { | |
2041 | /* | |
2042 | * Userspace can cause deadlock itself with | |
2043 | * flock(). Current behavior locally is to allow the | |
2044 | * deadlock, but abort the system call if a signal is | |
2045 | * received. We follow this example, otherwise a | |
2046 | * poorly written program could sit in kernel until | |
2047 | * reboot. | |
2048 | * | |
2049 | * Handling this is a bit more complicated for Ocfs2 | |
2050 | * though. We can't exit this function with an | |
2051 | * outstanding lock request, so a cancel convert is | |
2052 | * required. We intentionally overwrite 'ret' - if the | |
2053 | * cancel fails and the lock was granted, it's easier | |
af901ca1 | 2054 | * to just bubble success back up to the user. |
cf8e06f1 MF |
2055 | */ |
2056 | ret = ocfs2_flock_handle_signal(lockres, level); | |
1693a5c0 DT |
2057 | } else if (!ret && (level > lockres->l_level)) { |
2058 | /* Trylock failed asynchronously */ | |
2059 | BUG_ON(!trylock); | |
2060 | ret = -EAGAIN; | |
cf8e06f1 MF |
2061 | } |
2062 | ||
2063 | out: | |
2064 | ||
2065 | mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n", | |
2066 | lockres->l_name, ex, trylock, ret); | |
2067 | return ret; | |
2068 | } | |
2069 | ||
2070 | void ocfs2_file_unlock(struct file *file) | |
2071 | { | |
2072 | int ret; | |
de551246 | 2073 | unsigned int gen; |
cf8e06f1 MF |
2074 | unsigned long flags; |
2075 | struct ocfs2_file_private *fp = file->private_data; | |
2076 | struct ocfs2_lock_res *lockres = &fp->fp_flock; | |
2077 | struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb); | |
2078 | struct ocfs2_mask_waiter mw; | |
2079 | ||
2080 | ocfs2_init_mask_waiter(&mw); | |
2081 | ||
2082 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) | |
2083 | return; | |
2084 | ||
e988cf1c | 2085 | if (lockres->l_level == DLM_LOCK_NL) |
cf8e06f1 MF |
2086 | return; |
2087 | ||
2088 | mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n", | |
2089 | lockres->l_name, lockres->l_flags, lockres->l_level, | |
2090 | lockres->l_action); | |
2091 | ||
2092 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2093 | /* | |
2094 | * Fake a blocking ast for the downconvert code. | |
2095 | */ | |
2096 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); | |
bd3e7610 | 2097 | lockres->l_blocking = DLM_LOCK_EX; |
cf8e06f1 | 2098 | |
e988cf1c | 2099 | gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL); |
cf8e06f1 MF |
2100 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
2101 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2102 | ||
e988cf1c | 2103 | ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen); |
cf8e06f1 MF |
2104 | if (ret) { |
2105 | mlog_errno(ret); | |
2106 | return; | |
2107 | } | |
2108 | ||
2109 | ret = ocfs2_wait_for_mask(&mw); | |
2110 | if (ret) | |
2111 | mlog_errno(ret); | |
2112 | } | |
2113 | ||
34d024f8 MF |
2114 | static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb, |
2115 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
2116 | { |
2117 | int kick = 0; | |
2118 | ||
ccd979bd | 2119 | /* If we know that another node is waiting on our lock, kick |
34d024f8 | 2120 | * the downconvert thread * pre-emptively when we reach a release |
ccd979bd MF |
2121 | * condition. */ |
2122 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { | |
2123 | switch(lockres->l_blocking) { | |
bd3e7610 | 2124 | case DLM_LOCK_EX: |
ccd979bd MF |
2125 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
2126 | kick = 1; | |
2127 | break; | |
bd3e7610 | 2128 | case DLM_LOCK_PR: |
ccd979bd MF |
2129 | if (!lockres->l_ex_holders) |
2130 | kick = 1; | |
2131 | break; | |
2132 | default: | |
2133 | BUG(); | |
2134 | } | |
2135 | } | |
2136 | ||
2137 | if (kick) | |
34d024f8 | 2138 | ocfs2_wake_downconvert_thread(osb); |
ccd979bd MF |
2139 | } |
2140 | ||
ccd979bd | 2141 | #define OCFS2_SEC_BITS 34 |
31cc0c80 | 2142 | #define OCFS2_SEC_SHIFT (64 - OCFS2_SEC_BITS) |
ccd979bd MF |
2143 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) |
2144 | ||
2145 | /* LVB only has room for 64 bits of time here so we pack it for | |
2146 | * now. */ | |
3a3d1e51 | 2147 | static u64 ocfs2_pack_timespec(struct timespec64 *spec) |
ccd979bd MF |
2148 | { |
2149 | u64 res; | |
3a3d1e51 | 2150 | u64 sec = clamp_t(time64_t, spec->tv_sec, 0, 0x3ffffffffull); |
ccd979bd MF |
2151 | u32 nsec = spec->tv_nsec; |
2152 | ||
2153 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); | |
2154 | ||
2155 | return res; | |
2156 | } | |
2157 | ||
2158 | /* Call this with the lockres locked. I am reasonably sure we don't | |
2159 | * need ip_lock in this function as anyone who would be changing those | |
e63aecb6 | 2160 | * values is supposed to be blocked in ocfs2_inode_lock right now. */ |
ccd979bd MF |
2161 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
2162 | { | |
2163 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2164 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
2165 | struct ocfs2_meta_lvb *lvb; |
2166 | ||
a641dc2a | 2167 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2168 | |
24c19ef4 MF |
2169 | /* |
2170 | * Invalidate the LVB of a deleted inode - this way other | |
2171 | * nodes are forced to go to disk and discover the new inode | |
2172 | * status. | |
2173 | */ | |
2174 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
2175 | lvb->lvb_version = 0; | |
2176 | goto out; | |
2177 | } | |
2178 | ||
4d3b83f7 | 2179 | lvb->lvb_version = OCFS2_LVB_VERSION; |
ccd979bd MF |
2180 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
2181 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); | |
03ab30f7 EB |
2182 | lvb->lvb_iuid = cpu_to_be32(i_uid_read(inode)); |
2183 | lvb->lvb_igid = cpu_to_be32(i_gid_read(inode)); | |
ccd979bd MF |
2184 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); |
2185 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); | |
2186 | lvb->lvb_iatime_packed = | |
3a3d1e51 | 2187 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); |
ccd979bd | 2188 | lvb->lvb_ictime_packed = |
3a3d1e51 | 2189 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); |
ccd979bd | 2190 | lvb->lvb_imtime_packed = |
3a3d1e51 | 2191 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); |
ca4d147e | 2192 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
15b1e36b | 2193 | lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); |
f9e2d82e | 2194 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
ccd979bd | 2195 | |
24c19ef4 | 2196 | out: |
ccd979bd | 2197 | mlog_meta_lvb(0, lockres); |
ccd979bd MF |
2198 | } |
2199 | ||
3a3d1e51 | 2200 | static void ocfs2_unpack_timespec(struct timespec64 *spec, |
ccd979bd MF |
2201 | u64 packed_time) |
2202 | { | |
2203 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; | |
2204 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; | |
2205 | } | |
2206 | ||
2207 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) | |
2208 | { | |
2209 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2210 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd MF |
2211 | struct ocfs2_meta_lvb *lvb; |
2212 | ||
ccd979bd MF |
2213 | mlog_meta_lvb(0, lockres); |
2214 | ||
a641dc2a | 2215 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
2216 | |
2217 | /* We're safe here without the lockres lock... */ | |
2218 | spin_lock(&oi->ip_lock); | |
2219 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); | |
2220 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); | |
2221 | ||
ca4d147e | 2222 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
15b1e36b | 2223 | oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); |
ca4d147e HP |
2224 | ocfs2_set_inode_flags(inode); |
2225 | ||
ccd979bd MF |
2226 | /* fast-symlinks are a special case */ |
2227 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) | |
2228 | inode->i_blocks = 0; | |
2229 | else | |
8110b073 | 2230 | inode->i_blocks = ocfs2_inode_sector_count(inode); |
ccd979bd | 2231 | |
03ab30f7 EB |
2232 | i_uid_write(inode, be32_to_cpu(lvb->lvb_iuid)); |
2233 | i_gid_write(inode, be32_to_cpu(lvb->lvb_igid)); | |
ccd979bd | 2234 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); |
bfe86848 | 2235 | set_nlink(inode, be16_to_cpu(lvb->lvb_inlink)); |
3a3d1e51 | 2236 | ocfs2_unpack_timespec(&inode->i_atime, |
ccd979bd | 2237 | be64_to_cpu(lvb->lvb_iatime_packed)); |
3a3d1e51 | 2238 | ocfs2_unpack_timespec(&inode->i_mtime, |
ccd979bd | 2239 | be64_to_cpu(lvb->lvb_imtime_packed)); |
3a3d1e51 | 2240 | ocfs2_unpack_timespec(&inode->i_ctime, |
ccd979bd MF |
2241 | be64_to_cpu(lvb->lvb_ictime_packed)); |
2242 | spin_unlock(&oi->ip_lock); | |
ccd979bd MF |
2243 | } |
2244 | ||
f9e2d82e MF |
2245 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
2246 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 2247 | { |
a641dc2a | 2248 | struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd | 2249 | |
1c520dfb JB |
2250 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) |
2251 | && lvb->lvb_version == OCFS2_LVB_VERSION | |
f9e2d82e | 2252 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) |
ccd979bd MF |
2253 | return 1; |
2254 | return 0; | |
2255 | } | |
2256 | ||
2257 | /* Determine whether a lock resource needs to be refreshed, and | |
2258 | * arbitrate who gets to refresh it. | |
2259 | * | |
2260 | * 0 means no refresh needed. | |
2261 | * | |
2262 | * > 0 means you need to refresh this and you MUST call | |
2263 | * ocfs2_complete_lock_res_refresh afterwards. */ | |
2264 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) | |
2265 | { | |
2266 | unsigned long flags; | |
2267 | int status = 0; | |
2268 | ||
ccd979bd MF |
2269 | refresh_check: |
2270 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2271 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { | |
2272 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2273 | goto bail; | |
2274 | } | |
2275 | ||
2276 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { | |
2277 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2278 | ||
2279 | ocfs2_wait_on_refreshing_lock(lockres); | |
2280 | goto refresh_check; | |
2281 | } | |
2282 | ||
2283 | /* Ok, I'll be the one to refresh this lock. */ | |
2284 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2285 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2286 | ||
2287 | status = 1; | |
2288 | bail: | |
c1e8d35e | 2289 | mlog(0, "status %d\n", status); |
ccd979bd MF |
2290 | return status; |
2291 | } | |
2292 | ||
2293 | /* If status is non zero, I'll mark it as not being in refresh | |
2294 | * anymroe, but i won't clear the needs refresh flag. */ | |
2295 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, | |
2296 | int status) | |
2297 | { | |
2298 | unsigned long flags; | |
ccd979bd MF |
2299 | |
2300 | spin_lock_irqsave(&lockres->l_lock, flags); | |
2301 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); | |
2302 | if (!status) | |
2303 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); | |
2304 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
2305 | ||
2306 | wake_up(&lockres->l_event); | |
ccd979bd MF |
2307 | } |
2308 | ||
2309 | /* may or may not return a bh if it went to disk. */ | |
e63aecb6 | 2310 | static int ocfs2_inode_lock_update(struct inode *inode, |
ccd979bd MF |
2311 | struct buffer_head **bh) |
2312 | { | |
2313 | int status = 0; | |
2314 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
e63aecb6 | 2315 | struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres; |
ccd979bd | 2316 | struct ocfs2_dinode *fe; |
c271c5c2 | 2317 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2318 | |
be9e986b MF |
2319 | if (ocfs2_mount_local(osb)) |
2320 | goto bail; | |
2321 | ||
ccd979bd MF |
2322 | spin_lock(&oi->ip_lock); |
2323 | if (oi->ip_flags & OCFS2_INODE_DELETED) { | |
b0697053 | 2324 | mlog(0, "Orphaned inode %llu was deleted while we " |
ccd979bd | 2325 | "were waiting on a lock. ip_flags = 0x%x\n", |
b0697053 | 2326 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
ccd979bd MF |
2327 | spin_unlock(&oi->ip_lock); |
2328 | status = -ENOENT; | |
2329 | goto bail; | |
2330 | } | |
2331 | spin_unlock(&oi->ip_lock); | |
2332 | ||
be9e986b MF |
2333 | if (!ocfs2_should_refresh_lock_res(lockres)) |
2334 | goto bail; | |
ccd979bd MF |
2335 | |
2336 | /* This will discard any caching information we might have had | |
2337 | * for the inode metadata. */ | |
8cb471e8 | 2338 | ocfs2_metadata_cache_purge(INODE_CACHE(inode)); |
ccd979bd | 2339 | |
83418978 MF |
2340 | ocfs2_extent_map_trunc(inode, 0); |
2341 | ||
be9e986b | 2342 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
b0697053 MF |
2343 | mlog(0, "Trusting LVB on inode %llu\n", |
2344 | (unsigned long long)oi->ip_blkno); | |
ccd979bd MF |
2345 | ocfs2_refresh_inode_from_lvb(inode); |
2346 | } else { | |
2347 | /* Boo, we have to go to disk. */ | |
2348 | /* read bh, cast, ocfs2_refresh_inode */ | |
b657c95c | 2349 | status = ocfs2_read_inode_block(inode, bh); |
ccd979bd MF |
2350 | if (status < 0) { |
2351 | mlog_errno(status); | |
2352 | goto bail_refresh; | |
2353 | } | |
2354 | fe = (struct ocfs2_dinode *) (*bh)->b_data; | |
2355 | ||
2356 | /* This is a good chance to make sure we're not | |
b657c95c JB |
2357 | * locking an invalid object. ocfs2_read_inode_block() |
2358 | * already checked that the inode block is sane. | |
ccd979bd MF |
2359 | * |
2360 | * We bug on a stale inode here because we checked | |
2361 | * above whether it was wiped from disk. The wiping | |
2362 | * node provides a guarantee that we receive that | |
2363 | * message and can mark the inode before dropping any | |
2364 | * locks associated with it. */ | |
ccd979bd MF |
2365 | mlog_bug_on_msg(inode->i_generation != |
2366 | le32_to_cpu(fe->i_generation), | |
b0697053 | 2367 | "Invalid dinode %llu disk generation: %u " |
ccd979bd | 2368 | "inode->i_generation: %u\n", |
b0697053 MF |
2369 | (unsigned long long)oi->ip_blkno, |
2370 | le32_to_cpu(fe->i_generation), | |
ccd979bd MF |
2371 | inode->i_generation); |
2372 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || | |
2373 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), | |
b0697053 MF |
2374 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
2375 | (unsigned long long)oi->ip_blkno, | |
2376 | (unsigned long long)le64_to_cpu(fe->i_dtime), | |
ccd979bd MF |
2377 | le32_to_cpu(fe->i_flags)); |
2378 | ||
2379 | ocfs2_refresh_inode(inode, fe); | |
8ddb7b00 | 2380 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2381 | } |
2382 | ||
2383 | status = 0; | |
2384 | bail_refresh: | |
be9e986b | 2385 | ocfs2_complete_lock_res_refresh(lockres, status); |
ccd979bd | 2386 | bail: |
ccd979bd MF |
2387 | return status; |
2388 | } | |
2389 | ||
2390 | static int ocfs2_assign_bh(struct inode *inode, | |
2391 | struct buffer_head **ret_bh, | |
2392 | struct buffer_head *passed_bh) | |
2393 | { | |
2394 | int status; | |
2395 | ||
2396 | if (passed_bh) { | |
2397 | /* Ok, the update went to disk for us, use the | |
2398 | * returned bh. */ | |
2399 | *ret_bh = passed_bh; | |
2400 | get_bh(*ret_bh); | |
2401 | ||
2402 | return 0; | |
2403 | } | |
2404 | ||
b657c95c | 2405 | status = ocfs2_read_inode_block(inode, ret_bh); |
ccd979bd MF |
2406 | if (status < 0) |
2407 | mlog_errno(status); | |
2408 | ||
2409 | return status; | |
2410 | } | |
2411 | ||
2412 | /* | |
2413 | * returns < 0 error if the callback will never be called, otherwise | |
2414 | * the result of the lock will be communicated via the callback. | |
2415 | */ | |
cb25797d JK |
2416 | int ocfs2_inode_lock_full_nested(struct inode *inode, |
2417 | struct buffer_head **ret_bh, | |
2418 | int ex, | |
2419 | int arg_flags, | |
2420 | int subclass) | |
ccd979bd | 2421 | { |
bd3e7610 JB |
2422 | int status, level, acquired; |
2423 | u32 dlm_flags; | |
c271c5c2 | 2424 | struct ocfs2_lock_res *lockres = NULL; |
ccd979bd MF |
2425 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
2426 | struct buffer_head *local_bh = NULL; | |
2427 | ||
b0697053 MF |
2428 | mlog(0, "inode %llu, take %s META lock\n", |
2429 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2430 | ex ? "EXMODE" : "PRMODE"); |
2431 | ||
2432 | status = 0; | |
2433 | acquired = 0; | |
2434 | /* We'll allow faking a readonly metadata lock for | |
2435 | * rodevices. */ | |
2436 | if (ocfs2_is_hard_readonly(osb)) { | |
2437 | if (ex) | |
2438 | status = -EROFS; | |
03efed8a | 2439 | goto getbh; |
ccd979bd MF |
2440 | } |
2441 | ||
439a36b8 ER |
2442 | if ((arg_flags & OCFS2_META_LOCK_GETBH) || |
2443 | ocfs2_mount_local(osb)) | |
2444 | goto update; | |
c271c5c2 | 2445 | |
ccd979bd | 2446 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
553abd04 | 2447 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2448 | |
e63aecb6 | 2449 | lockres = &OCFS2_I(inode)->ip_inode_lockres; |
bd3e7610 | 2450 | level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2451 | dlm_flags = 0; |
2452 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) | |
bd3e7610 | 2453 | dlm_flags |= DLM_LKF_NOQUEUE; |
ccd979bd | 2454 | |
cb25797d JK |
2455 | status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags, |
2456 | arg_flags, subclass, _RET_IP_); | |
ccd979bd | 2457 | if (status < 0) { |
41003a7b | 2458 | if (status != -EAGAIN) |
ccd979bd MF |
2459 | mlog_errno(status); |
2460 | goto bail; | |
2461 | } | |
2462 | ||
2463 | /* Notify the error cleanup path to drop the cluster lock. */ | |
2464 | acquired = 1; | |
2465 | ||
2466 | /* We wait twice because a node may have died while we were in | |
2467 | * the lower dlm layers. The second time though, we've | |
2468 | * committed to owning this lock so we don't allow signals to | |
2469 | * abort the operation. */ | |
2470 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) | |
553abd04 | 2471 | ocfs2_wait_for_recovery(osb); |
ccd979bd | 2472 | |
439a36b8 | 2473 | update: |
24c19ef4 MF |
2474 | /* |
2475 | * We only see this flag if we're being called from | |
2476 | * ocfs2_read_locked_inode(). It means we're locking an inode | |
2477 | * which hasn't been populated yet, so clear the refresh flag | |
2478 | * and let the caller handle it. | |
2479 | */ | |
2480 | if (inode->i_state & I_NEW) { | |
2481 | status = 0; | |
c271c5c2 SM |
2482 | if (lockres) |
2483 | ocfs2_complete_lock_res_refresh(lockres, 0); | |
24c19ef4 MF |
2484 | goto bail; |
2485 | } | |
2486 | ||
ccd979bd | 2487 | /* This is fun. The caller may want a bh back, or it may |
e63aecb6 | 2488 | * not. ocfs2_inode_lock_update definitely wants one in, but |
ccd979bd MF |
2489 | * may or may not read one, depending on what's in the |
2490 | * LVB. The result of all of this is that we've *only* gone to | |
2491 | * disk if we have to, so the complexity is worthwhile. */ | |
e63aecb6 | 2492 | status = ocfs2_inode_lock_update(inode, &local_bh); |
ccd979bd MF |
2493 | if (status < 0) { |
2494 | if (status != -ENOENT) | |
2495 | mlog_errno(status); | |
2496 | goto bail; | |
2497 | } | |
03efed8a | 2498 | getbh: |
ccd979bd MF |
2499 | if (ret_bh) { |
2500 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); | |
2501 | if (status < 0) { | |
2502 | mlog_errno(status); | |
2503 | goto bail; | |
2504 | } | |
2505 | } | |
2506 | ||
ccd979bd MF |
2507 | bail: |
2508 | if (status < 0) { | |
2509 | if (ret_bh && (*ret_bh)) { | |
2510 | brelse(*ret_bh); | |
2511 | *ret_bh = NULL; | |
2512 | } | |
2513 | if (acquired) | |
e63aecb6 | 2514 | ocfs2_inode_unlock(inode, ex); |
ccd979bd MF |
2515 | } |
2516 | ||
a89bd89f | 2517 | brelse(local_bh); |
ccd979bd MF |
2518 | return status; |
2519 | } | |
2520 | ||
2521 | /* | |
34d024f8 MF |
2522 | * This is working around a lock inversion between tasks acquiring DLM |
2523 | * locks while holding a page lock and the downconvert thread which | |
2524 | * blocks dlm lock acquiry while acquiring page locks. | |
ccd979bd MF |
2525 | * |
2526 | * ** These _with_page variantes are only intended to be called from aop | |
2527 | * methods that hold page locks and return a very specific *positive* error | |
2528 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** | |
2529 | * | |
34d024f8 MF |
2530 | * The DLM is called such that it returns -EAGAIN if it would have |
2531 | * blocked waiting for the downconvert thread. In that case we unlock | |
2532 | * our page so the downconvert thread can make progress. Once we've | |
2533 | * done this we have to return AOP_TRUNCATED_PAGE so the aop method | |
2534 | * that called us can bubble that back up into the VFS who will then | |
2535 | * immediately retry the aop call. | |
ccd979bd | 2536 | */ |
e63aecb6 | 2537 | int ocfs2_inode_lock_with_page(struct inode *inode, |
ccd979bd MF |
2538 | struct buffer_head **ret_bh, |
2539 | int ex, | |
2540 | struct page *page) | |
2541 | { | |
2542 | int ret; | |
2543 | ||
e63aecb6 | 2544 | ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); |
ccd979bd MF |
2545 | if (ret == -EAGAIN) { |
2546 | unlock_page(page); | |
ff26cc10 GH |
2547 | /* |
2548 | * If we can't get inode lock immediately, we should not return | |
2549 | * directly here, since this will lead to a softlockup problem. | |
2550 | * The method is to get a blocking lock and immediately unlock | |
2551 | * before returning, this can avoid CPU resource waste due to | |
2552 | * lots of retries, and benefits fairness in getting lock. | |
2553 | */ | |
2554 | if (ocfs2_inode_lock(inode, ret_bh, ex) == 0) | |
2555 | ocfs2_inode_unlock(inode, ex); | |
ccd979bd MF |
2556 | ret = AOP_TRUNCATED_PAGE; |
2557 | } | |
2558 | ||
2559 | return ret; | |
2560 | } | |
2561 | ||
e63aecb6 | 2562 | int ocfs2_inode_lock_atime(struct inode *inode, |
7f1a37e3 | 2563 | struct vfsmount *vfsmnt, |
c4c2416a | 2564 | int *level, int wait) |
7f1a37e3 TY |
2565 | { |
2566 | int ret; | |
2567 | ||
c4c2416a GH |
2568 | if (wait) |
2569 | ret = ocfs2_inode_lock(inode, NULL, 0); | |
2570 | else | |
2571 | ret = ocfs2_try_inode_lock(inode, NULL, 0); | |
2572 | ||
7f1a37e3 | 2573 | if (ret < 0) { |
c4c2416a GH |
2574 | if (ret != -EAGAIN) |
2575 | mlog_errno(ret); | |
7f1a37e3 TY |
2576 | return ret; |
2577 | } | |
2578 | ||
2579 | /* | |
2580 | * If we should update atime, we will get EX lock, | |
2581 | * otherwise we just get PR lock. | |
2582 | */ | |
2583 | if (ocfs2_should_update_atime(inode, vfsmnt)) { | |
2584 | struct buffer_head *bh = NULL; | |
2585 | ||
e63aecb6 | 2586 | ocfs2_inode_unlock(inode, 0); |
c4c2416a GH |
2587 | if (wait) |
2588 | ret = ocfs2_inode_lock(inode, &bh, 1); | |
2589 | else | |
2590 | ret = ocfs2_try_inode_lock(inode, &bh, 1); | |
2591 | ||
7f1a37e3 | 2592 | if (ret < 0) { |
c4c2416a GH |
2593 | if (ret != -EAGAIN) |
2594 | mlog_errno(ret); | |
7f1a37e3 TY |
2595 | return ret; |
2596 | } | |
2597 | *level = 1; | |
2598 | if (ocfs2_should_update_atime(inode, vfsmnt)) | |
2599 | ocfs2_update_inode_atime(inode, bh); | |
a89bd89f | 2600 | brelse(bh); |
7f1a37e3 TY |
2601 | } else |
2602 | *level = 0; | |
2603 | ||
7f1a37e3 TY |
2604 | return ret; |
2605 | } | |
2606 | ||
e63aecb6 | 2607 | void ocfs2_inode_unlock(struct inode *inode, |
ccd979bd MF |
2608 | int ex) |
2609 | { | |
bd3e7610 | 2610 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
e63aecb6 | 2611 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres; |
c271c5c2 | 2612 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
ccd979bd | 2613 | |
b0697053 MF |
2614 | mlog(0, "inode %llu drop %s META lock\n", |
2615 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
2616 | ex ? "EXMODE" : "PRMODE"); |
2617 | ||
1119d3c0 | 2618 | if (!ocfs2_is_hard_readonly(osb) && |
c271c5c2 | 2619 | !ocfs2_mount_local(osb)) |
1119d3c0 | 2620 | ocfs2_cluster_unlock(osb, lockres, level); |
ccd979bd MF |
2621 | } |
2622 | ||
439a36b8 ER |
2623 | /* |
2624 | * This _tracker variantes are introduced to deal with the recursive cluster | |
2625 | * locking issue. The idea is to keep track of a lock holder on the stack of | |
2626 | * the current process. If there's a lock holder on the stack, we know the | |
2627 | * task context is already protected by cluster locking. Currently, they're | |
2628 | * used in some VFS entry routines. | |
2629 | * | |
2630 | * return < 0 on error, return == 0 if there's no lock holder on the stack | |
2631 | * before this call, return == 1 if this call would be a recursive locking. | |
133b81f2 LC |
2632 | * return == -1 if this lock attempt will cause an upgrade which is forbidden. |
2633 | * | |
2634 | * When taking lock levels into account,we face some different situations. | |
2635 | * | |
2636 | * 1. no lock is held | |
2637 | * In this case, just lock the inode as requested and return 0 | |
2638 | * | |
2639 | * 2. We are holding a lock | |
2640 | * For this situation, things diverges into several cases | |
2641 | * | |
2642 | * wanted holding what to do | |
2643 | * ex ex see 2.1 below | |
2644 | * ex pr see 2.2 below | |
2645 | * pr ex see 2.1 below | |
2646 | * pr pr see 2.1 below | |
2647 | * | |
2648 | * 2.1 lock level that is been held is compatible | |
2649 | * with the wanted level, so no lock action will be tacken. | |
2650 | * | |
2651 | * 2.2 Otherwise, an upgrade is needed, but it is forbidden. | |
2652 | * | |
2653 | * Reason why upgrade within a process is forbidden is that | |
2654 | * lock upgrade may cause dead lock. The following illustrates | |
2655 | * how it happens. | |
2656 | * | |
2657 | * thread on node1 thread on node2 | |
2658 | * ocfs2_inode_lock_tracker(ex=0) | |
2659 | * | |
2660 | * <====== ocfs2_inode_lock_tracker(ex=1) | |
2661 | * | |
2662 | * ocfs2_inode_lock_tracker(ex=1) | |
439a36b8 ER |
2663 | */ |
2664 | int ocfs2_inode_lock_tracker(struct inode *inode, | |
2665 | struct buffer_head **ret_bh, | |
2666 | int ex, | |
2667 | struct ocfs2_lock_holder *oh) | |
2668 | { | |
133b81f2 | 2669 | int status = 0; |
439a36b8 | 2670 | struct ocfs2_lock_res *lockres; |
133b81f2 LC |
2671 | struct ocfs2_lock_holder *tmp_oh; |
2672 | struct pid *pid = task_pid(current); | |
2673 | ||
439a36b8 ER |
2674 | |
2675 | lockres = &OCFS2_I(inode)->ip_inode_lockres; | |
133b81f2 | 2676 | tmp_oh = ocfs2_pid_holder(lockres, pid); |
439a36b8 | 2677 | |
133b81f2 LC |
2678 | if (!tmp_oh) { |
2679 | /* | |
2680 | * This corresponds to the case 1. | |
2681 | * We haven't got any lock before. | |
2682 | */ | |
2683 | status = ocfs2_inode_lock_full(inode, ret_bh, ex, 0); | |
439a36b8 ER |
2684 | if (status < 0) { |
2685 | if (status != -ENOENT) | |
2686 | mlog_errno(status); | |
2687 | return status; | |
2688 | } | |
133b81f2 LC |
2689 | |
2690 | oh->oh_ex = ex; | |
439a36b8 | 2691 | ocfs2_add_holder(lockres, oh); |
133b81f2 LC |
2692 | return 0; |
2693 | } | |
439a36b8 | 2694 | |
133b81f2 LC |
2695 | if (unlikely(ex && !tmp_oh->oh_ex)) { |
2696 | /* | |
2697 | * case 2.2 upgrade may cause dead lock, forbid it. | |
2698 | */ | |
2699 | mlog(ML_ERROR, "Recursive locking is not permitted to " | |
2700 | "upgrade to EX level from PR level.\n"); | |
2701 | dump_stack(); | |
2702 | return -EINVAL; | |
2703 | } | |
2704 | ||
2705 | /* | |
2706 | * case 2.1 OCFS2_META_LOCK_GETBH flag make ocfs2_inode_lock_full. | |
2707 | * ignore the lock level and just update it. | |
2708 | */ | |
2709 | if (ret_bh) { | |
2710 | status = ocfs2_inode_lock_full(inode, ret_bh, ex, | |
2711 | OCFS2_META_LOCK_GETBH); | |
2712 | if (status < 0) { | |
2713 | if (status != -ENOENT) | |
2714 | mlog_errno(status); | |
2715 | return status; | |
2716 | } | |
2717 | } | |
2718 | return tmp_oh ? 1 : 0; | |
439a36b8 ER |
2719 | } |
2720 | ||
2721 | void ocfs2_inode_unlock_tracker(struct inode *inode, | |
2722 | int ex, | |
2723 | struct ocfs2_lock_holder *oh, | |
2724 | int had_lock) | |
2725 | { | |
2726 | struct ocfs2_lock_res *lockres; | |
2727 | ||
2728 | lockres = &OCFS2_I(inode)->ip_inode_lockres; | |
8818efaa | 2729 | /* had_lock means that the currect process already takes the cluster |
133b81f2 LC |
2730 | * lock previously. |
2731 | * If had_lock is 1, we have nothing to do here. | |
2732 | * If had_lock is 0, we will release the lock. | |
8818efaa | 2733 | */ |
439a36b8 | 2734 | if (!had_lock) { |
133b81f2 | 2735 | ocfs2_inode_unlock(inode, oh->oh_ex); |
439a36b8 | 2736 | ocfs2_remove_holder(lockres, oh); |
439a36b8 ER |
2737 | } |
2738 | } | |
2739 | ||
df152c24 | 2740 | int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno) |
83273932 SE |
2741 | { |
2742 | struct ocfs2_lock_res *lockres; | |
2743 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 SE |
2744 | int status = 0; |
2745 | ||
df152c24 SM |
2746 | if (ocfs2_is_hard_readonly(osb)) |
2747 | return -EROFS; | |
2748 | ||
2749 | if (ocfs2_mount_local(osb)) | |
2750 | return 0; | |
2751 | ||
83273932 | 2752 | lockres = &osb->osb_orphan_scan.os_lockres; |
df152c24 | 2753 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
83273932 SE |
2754 | if (status < 0) |
2755 | return status; | |
2756 | ||
2757 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
1c520dfb JB |
2758 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
2759 | lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION) | |
83273932 | 2760 | *seqno = be32_to_cpu(lvb->lvb_os_seqno); |
3211949f SM |
2761 | else |
2762 | *seqno = osb->osb_orphan_scan.os_seqno + 1; | |
2763 | ||
83273932 SE |
2764 | return status; |
2765 | } | |
2766 | ||
df152c24 | 2767 | void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno) |
83273932 SE |
2768 | { |
2769 | struct ocfs2_lock_res *lockres; | |
2770 | struct ocfs2_orphan_scan_lvb *lvb; | |
83273932 | 2771 | |
df152c24 SM |
2772 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) { |
2773 | lockres = &osb->osb_orphan_scan.os_lockres; | |
2774 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2775 | lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION; | |
2776 | lvb->lvb_os_seqno = cpu_to_be32(seqno); | |
2777 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2778 | } | |
83273932 SE |
2779 | } |
2780 | ||
ccd979bd MF |
2781 | int ocfs2_super_lock(struct ocfs2_super *osb, |
2782 | int ex) | |
2783 | { | |
c271c5c2 | 2784 | int status = 0; |
bd3e7610 | 2785 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd | 2786 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
ccd979bd | 2787 | |
ccd979bd MF |
2788 | if (ocfs2_is_hard_readonly(osb)) |
2789 | return -EROFS; | |
2790 | ||
c271c5c2 SM |
2791 | if (ocfs2_mount_local(osb)) |
2792 | goto bail; | |
2793 | ||
ccd979bd MF |
2794 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
2795 | if (status < 0) { | |
2796 | mlog_errno(status); | |
2797 | goto bail; | |
2798 | } | |
2799 | ||
2800 | /* The super block lock path is really in the best position to | |
2801 | * know when resources covered by the lock need to be | |
2802 | * refreshed, so we do it here. Of course, making sense of | |
2803 | * everything is up to the caller :) */ | |
2804 | status = ocfs2_should_refresh_lock_res(lockres); | |
ccd979bd | 2805 | if (status) { |
8e8a4603 | 2806 | status = ocfs2_refresh_slot_info(osb); |
ccd979bd MF |
2807 | |
2808 | ocfs2_complete_lock_res_refresh(lockres, status); | |
2809 | ||
3278bb74 JB |
2810 | if (status < 0) { |
2811 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd | 2812 | mlog_errno(status); |
3278bb74 | 2813 | } |
8ddb7b00 | 2814 | ocfs2_track_lock_refresh(lockres); |
ccd979bd MF |
2815 | } |
2816 | bail: | |
ccd979bd MF |
2817 | return status; |
2818 | } | |
2819 | ||
2820 | void ocfs2_super_unlock(struct ocfs2_super *osb, | |
2821 | int ex) | |
2822 | { | |
bd3e7610 | 2823 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
ccd979bd MF |
2824 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
2825 | ||
c271c5c2 SM |
2826 | if (!ocfs2_mount_local(osb)) |
2827 | ocfs2_cluster_unlock(osb, lockres, level); | |
ccd979bd MF |
2828 | } |
2829 | ||
2830 | int ocfs2_rename_lock(struct ocfs2_super *osb) | |
2831 | { | |
2832 | int status; | |
2833 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2834 | ||
2835 | if (ocfs2_is_hard_readonly(osb)) | |
2836 | return -EROFS; | |
2837 | ||
c271c5c2 SM |
2838 | if (ocfs2_mount_local(osb)) |
2839 | return 0; | |
2840 | ||
bd3e7610 | 2841 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0); |
ccd979bd MF |
2842 | if (status < 0) |
2843 | mlog_errno(status); | |
2844 | ||
2845 | return status; | |
2846 | } | |
2847 | ||
2848 | void ocfs2_rename_unlock(struct ocfs2_super *osb) | |
2849 | { | |
2850 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; | |
2851 | ||
c271c5c2 | 2852 | if (!ocfs2_mount_local(osb)) |
bd3e7610 | 2853 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); |
ccd979bd MF |
2854 | } |
2855 | ||
6ca497a8 | 2856 | int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex) |
2857 | { | |
2858 | int status; | |
2859 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2860 | ||
2861 | if (ocfs2_is_hard_readonly(osb)) | |
2862 | return -EROFS; | |
2863 | ||
4cd9973f JB |
2864 | if (ex) |
2865 | down_write(&osb->nfs_sync_rwlock); | |
2866 | else | |
2867 | down_read(&osb->nfs_sync_rwlock); | |
2868 | ||
6ca497a8 | 2869 | if (ocfs2_mount_local(osb)) |
2870 | return 0; | |
2871 | ||
2872 | status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE, | |
2873 | 0, 0); | |
57c720d4 | 2874 | if (status < 0) { |
6ca497a8 | 2875 | mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status); |
2876 | ||
57c720d4 PM |
2877 | if (ex) |
2878 | up_write(&osb->nfs_sync_rwlock); | |
2879 | else | |
2880 | up_read(&osb->nfs_sync_rwlock); | |
2881 | } | |
2882 | ||
6ca497a8 | 2883 | return status; |
2884 | } | |
2885 | ||
2886 | void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex) | |
2887 | { | |
2888 | struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres; | |
2889 | ||
2890 | if (!ocfs2_mount_local(osb)) | |
2891 | ocfs2_cluster_unlock(osb, lockres, | |
2892 | ex ? LKM_EXMODE : LKM_PRMODE); | |
4cd9973f JB |
2893 | if (ex) |
2894 | up_write(&osb->nfs_sync_rwlock); | |
2895 | else | |
2896 | up_read(&osb->nfs_sync_rwlock); | |
6ca497a8 | 2897 | } |
2898 | ||
4882abeb GH |
2899 | int ocfs2_trim_fs_lock(struct ocfs2_super *osb, |
2900 | struct ocfs2_trim_fs_info *info, int trylock) | |
2901 | { | |
2902 | int status; | |
2903 | struct ocfs2_trim_fs_lvb *lvb; | |
2904 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
2905 | ||
2906 | if (info) | |
2907 | info->tf_valid = 0; | |
2908 | ||
2909 | if (ocfs2_is_hard_readonly(osb)) | |
2910 | return -EROFS; | |
2911 | ||
2912 | if (ocfs2_mount_local(osb)) | |
2913 | return 0; | |
2914 | ||
2915 | status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, | |
2916 | trylock ? DLM_LKF_NOQUEUE : 0, 0); | |
2917 | if (status < 0) { | |
2918 | if (status != -EAGAIN) | |
2919 | mlog_errno(status); | |
2920 | return status; | |
2921 | } | |
2922 | ||
2923 | if (info) { | |
2924 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2925 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && | |
2926 | lvb->lvb_version == OCFS2_TRIMFS_LVB_VERSION) { | |
2927 | info->tf_valid = 1; | |
2928 | info->tf_success = lvb->lvb_success; | |
2929 | info->tf_nodenum = be32_to_cpu(lvb->lvb_nodenum); | |
2930 | info->tf_start = be64_to_cpu(lvb->lvb_start); | |
2931 | info->tf_len = be64_to_cpu(lvb->lvb_len); | |
2932 | info->tf_minlen = be64_to_cpu(lvb->lvb_minlen); | |
2933 | info->tf_trimlen = be64_to_cpu(lvb->lvb_trimlen); | |
2934 | } | |
2935 | } | |
2936 | ||
2937 | return status; | |
2938 | } | |
2939 | ||
2940 | void ocfs2_trim_fs_unlock(struct ocfs2_super *osb, | |
2941 | struct ocfs2_trim_fs_info *info) | |
2942 | { | |
2943 | struct ocfs2_trim_fs_lvb *lvb; | |
2944 | struct ocfs2_lock_res *lockres = &osb->osb_trim_fs_lockres; | |
2945 | ||
2946 | if (ocfs2_mount_local(osb)) | |
2947 | return; | |
2948 | ||
2949 | if (info) { | |
2950 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
2951 | lvb->lvb_version = OCFS2_TRIMFS_LVB_VERSION; | |
2952 | lvb->lvb_success = info->tf_success; | |
2953 | lvb->lvb_nodenum = cpu_to_be32(info->tf_nodenum); | |
2954 | lvb->lvb_start = cpu_to_be64(info->tf_start); | |
2955 | lvb->lvb_len = cpu_to_be64(info->tf_len); | |
2956 | lvb->lvb_minlen = cpu_to_be64(info->tf_minlen); | |
2957 | lvb->lvb_trimlen = cpu_to_be64(info->tf_trimlen); | |
2958 | } | |
2959 | ||
2960 | ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX); | |
2961 | } | |
2962 | ||
d680efe9 MF |
2963 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
2964 | { | |
2965 | int ret; | |
bd3e7610 | 2966 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2967 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2968 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2969 | ||
2970 | BUG_ON(!dl); | |
2971 | ||
03efed8a TY |
2972 | if (ocfs2_is_hard_readonly(osb)) { |
2973 | if (ex) | |
2974 | return -EROFS; | |
2975 | return 0; | |
2976 | } | |
d680efe9 | 2977 | |
c271c5c2 SM |
2978 | if (ocfs2_mount_local(osb)) |
2979 | return 0; | |
2980 | ||
d680efe9 MF |
2981 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
2982 | if (ret < 0) | |
2983 | mlog_errno(ret); | |
2984 | ||
2985 | return ret; | |
2986 | } | |
2987 | ||
2988 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) | |
2989 | { | |
bd3e7610 | 2990 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; |
d680efe9 MF |
2991 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
2992 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); | |
2993 | ||
03efed8a | 2994 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
c271c5c2 | 2995 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); |
d680efe9 MF |
2996 | } |
2997 | ||
ccd979bd MF |
2998 | /* Reference counting of the dlm debug structure. We want this because |
2999 | * open references on the debug inodes can live on after a mount, so | |
3000 | * we can't rely on the ocfs2_super to always exist. */ | |
3001 | static void ocfs2_dlm_debug_free(struct kref *kref) | |
3002 | { | |
3003 | struct ocfs2_dlm_debug *dlm_debug; | |
3004 | ||
3005 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); | |
3006 | ||
3007 | kfree(dlm_debug); | |
3008 | } | |
3009 | ||
3010 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) | |
3011 | { | |
3012 | if (dlm_debug) | |
3013 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); | |
3014 | } | |
3015 | ||
3016 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) | |
3017 | { | |
3018 | kref_get(&debug->d_refcnt); | |
3019 | } | |
3020 | ||
3021 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) | |
3022 | { | |
3023 | struct ocfs2_dlm_debug *dlm_debug; | |
3024 | ||
3025 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); | |
3026 | if (!dlm_debug) { | |
3027 | mlog_errno(-ENOMEM); | |
3028 | goto out; | |
3029 | } | |
3030 | ||
3031 | kref_init(&dlm_debug->d_refcnt); | |
3032 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); | |
8056773a | 3033 | dlm_debug->d_filter_secs = 0; |
ccd979bd MF |
3034 | out: |
3035 | return dlm_debug; | |
3036 | } | |
3037 | ||
3038 | /* Access to this is arbitrated for us via seq_file->sem. */ | |
3039 | struct ocfs2_dlm_seq_priv { | |
3040 | struct ocfs2_dlm_debug *p_dlm_debug; | |
3041 | struct ocfs2_lock_res p_iter_res; | |
3042 | struct ocfs2_lock_res p_tmp_res; | |
3043 | }; | |
3044 | ||
3045 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, | |
3046 | struct ocfs2_dlm_seq_priv *priv) | |
3047 | { | |
3048 | struct ocfs2_lock_res *iter, *ret = NULL; | |
3049 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; | |
3050 | ||
3051 | assert_spin_locked(&ocfs2_dlm_tracking_lock); | |
3052 | ||
3053 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { | |
3054 | /* discover the head of the list */ | |
3055 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { | |
3056 | mlog(0, "End of list found, %p\n", ret); | |
3057 | break; | |
3058 | } | |
3059 | ||
3060 | /* We track our "dummy" iteration lockres' by a NULL | |
3061 | * l_ops field. */ | |
3062 | if (iter->l_ops != NULL) { | |
3063 | ret = iter; | |
3064 | break; | |
3065 | } | |
3066 | } | |
3067 | ||
3068 | return ret; | |
3069 | } | |
3070 | ||
3071 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) | |
3072 | { | |
3073 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
3074 | struct ocfs2_lock_res *iter; | |
3075 | ||
3076 | spin_lock(&ocfs2_dlm_tracking_lock); | |
3077 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); | |
3078 | if (iter) { | |
3079 | /* Since lockres' have the lifetime of their container | |
3080 | * (which can be inodes, ocfs2_supers, etc) we want to | |
3081 | * copy this out to a temporary lockres while still | |
3082 | * under the spinlock. Obviously after this we can't | |
3083 | * trust any pointers on the copy returned, but that's | |
3084 | * ok as the information we want isn't typically held | |
3085 | * in them. */ | |
3086 | priv->p_tmp_res = *iter; | |
3087 | iter = &priv->p_tmp_res; | |
3088 | } | |
3089 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
3090 | ||
3091 | return iter; | |
3092 | } | |
3093 | ||
3094 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) | |
3095 | { | |
3096 | } | |
3097 | ||
3098 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
3099 | { | |
3100 | struct ocfs2_dlm_seq_priv *priv = m->private; | |
3101 | struct ocfs2_lock_res *iter = v; | |
3102 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; | |
3103 | ||
3104 | spin_lock(&ocfs2_dlm_tracking_lock); | |
3105 | iter = ocfs2_dlm_next_res(iter, priv); | |
3106 | list_del_init(&dummy->l_debug_list); | |
3107 | if (iter) { | |
3108 | list_add(&dummy->l_debug_list, &iter->l_debug_list); | |
3109 | priv->p_tmp_res = *iter; | |
3110 | iter = &priv->p_tmp_res; | |
3111 | } | |
3112 | spin_unlock(&ocfs2_dlm_tracking_lock); | |
3113 | ||
3114 | return iter; | |
3115 | } | |
3116 | ||
5bc970e8 SM |
3117 | /* |
3118 | * Version is used by debugfs.ocfs2 to determine the format being used | |
3119 | * | |
3120 | * New in version 2 | |
3121 | * - Lock stats printed | |
3122 | * New in version 3 | |
3123 | * - Max time in lock stats is in usecs (instead of nsecs) | |
8a7f5f4c | 3124 | * New in version 4 |
5da844a2 | 3125 | * - Add last pr/ex unlock times and first lock wait time in usecs |
5bc970e8 | 3126 | */ |
8a7f5f4c | 3127 | #define OCFS2_DLM_DEBUG_STR_VERSION 4 |
ccd979bd MF |
3128 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
3129 | { | |
3130 | int i; | |
3131 | char *lvb; | |
3132 | struct ocfs2_lock_res *lockres = v; | |
8056773a GH |
3133 | #ifdef CONFIG_OCFS2_FS_STATS |
3134 | u64 now, last; | |
3135 | struct ocfs2_dlm_debug *dlm_debug = | |
3136 | ((struct ocfs2_dlm_seq_priv *)m->private)->p_dlm_debug; | |
3137 | #endif | |
ccd979bd MF |
3138 | |
3139 | if (!lockres) | |
3140 | return -EINVAL; | |
3141 | ||
8056773a | 3142 | #ifdef CONFIG_OCFS2_FS_STATS |
5da844a2 | 3143 | if (!lockres->l_lock_wait && dlm_debug->d_filter_secs) { |
8056773a GH |
3144 | now = ktime_to_us(ktime_get_real()); |
3145 | if (lockres->l_lock_prmode.ls_last > | |
3146 | lockres->l_lock_exmode.ls_last) | |
3147 | last = lockres->l_lock_prmode.ls_last; | |
3148 | else | |
3149 | last = lockres->l_lock_exmode.ls_last; | |
3150 | /* | |
3151 | * Use d_filter_secs field to filter lock resources dump, | |
3152 | * the default d_filter_secs(0) value filters nothing, | |
3153 | * otherwise, only dump the last N seconds active lock | |
3154 | * resources. | |
3155 | */ | |
3156 | if (div_u64(now - last, 1000000) > dlm_debug->d_filter_secs) | |
3157 | return 0; | |
3158 | } | |
3159 | #endif | |
3160 | ||
d680efe9 MF |
3161 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
3162 | ||
3163 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) | |
3164 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, | |
3165 | lockres->l_name, | |
3166 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); | |
3167 | else | |
3168 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); | |
3169 | ||
3170 | seq_printf(m, "%d\t" | |
ccd979bd MF |
3171 | "0x%lx\t" |
3172 | "0x%x\t" | |
3173 | "0x%x\t" | |
3174 | "%u\t" | |
3175 | "%u\t" | |
3176 | "%d\t" | |
3177 | "%d\t", | |
ccd979bd MF |
3178 | lockres->l_level, |
3179 | lockres->l_flags, | |
3180 | lockres->l_action, | |
3181 | lockres->l_unlock_action, | |
3182 | lockres->l_ro_holders, | |
3183 | lockres->l_ex_holders, | |
3184 | lockres->l_requested, | |
3185 | lockres->l_blocking); | |
3186 | ||
3187 | /* Dump the raw LVB */ | |
8f2c9c1b | 3188 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
ccd979bd MF |
3189 | for(i = 0; i < DLM_LVB_LEN; i++) |
3190 | seq_printf(m, "0x%x\t", lvb[i]); | |
3191 | ||
8ddb7b00 | 3192 | #ifdef CONFIG_OCFS2_FS_STATS |
5bc970e8 SM |
3193 | # define lock_num_prmode(_l) ((_l)->l_lock_prmode.ls_gets) |
3194 | # define lock_num_exmode(_l) ((_l)->l_lock_exmode.ls_gets) | |
3195 | # define lock_num_prmode_failed(_l) ((_l)->l_lock_prmode.ls_fail) | |
3196 | # define lock_num_exmode_failed(_l) ((_l)->l_lock_exmode.ls_fail) | |
3197 | # define lock_total_prmode(_l) ((_l)->l_lock_prmode.ls_total) | |
3198 | # define lock_total_exmode(_l) ((_l)->l_lock_exmode.ls_total) | |
3199 | # define lock_max_prmode(_l) ((_l)->l_lock_prmode.ls_max) | |
3200 | # define lock_max_exmode(_l) ((_l)->l_lock_exmode.ls_max) | |
3201 | # define lock_refresh(_l) ((_l)->l_lock_refresh) | |
8a7f5f4c GH |
3202 | # define lock_last_prmode(_l) ((_l)->l_lock_prmode.ls_last) |
3203 | # define lock_last_exmode(_l) ((_l)->l_lock_exmode.ls_last) | |
5da844a2 | 3204 | # define lock_wait(_l) ((_l)->l_lock_wait) |
8ddb7b00 | 3205 | #else |
5bc970e8 SM |
3206 | # define lock_num_prmode(_l) (0) |
3207 | # define lock_num_exmode(_l) (0) | |
8ddb7b00 SM |
3208 | # define lock_num_prmode_failed(_l) (0) |
3209 | # define lock_num_exmode_failed(_l) (0) | |
dd25e55e RD |
3210 | # define lock_total_prmode(_l) (0ULL) |
3211 | # define lock_total_exmode(_l) (0ULL) | |
8ddb7b00 SM |
3212 | # define lock_max_prmode(_l) (0) |
3213 | # define lock_max_exmode(_l) (0) | |
3214 | # define lock_refresh(_l) (0) | |
8a7f5f4c GH |
3215 | # define lock_last_prmode(_l) (0ULL) |
3216 | # define lock_last_exmode(_l) (0ULL) | |
5da844a2 | 3217 | # define lock_wait(_l) (0ULL) |
8ddb7b00 SM |
3218 | #endif |
3219 | /* The following seq_print was added in version 2 of this output */ | |
5bc970e8 SM |
3220 | seq_printf(m, "%u\t" |
3221 | "%u\t" | |
8ddb7b00 SM |
3222 | "%u\t" |
3223 | "%u\t" | |
3224 | "%llu\t" | |
3225 | "%llu\t" | |
3226 | "%u\t" | |
3227 | "%u\t" | |
8a7f5f4c GH |
3228 | "%u\t" |
3229 | "%llu\t" | |
5da844a2 | 3230 | "%llu\t" |
8a7f5f4c | 3231 | "%llu\t", |
8ddb7b00 SM |
3232 | lock_num_prmode(lockres), |
3233 | lock_num_exmode(lockres), | |
3234 | lock_num_prmode_failed(lockres), | |
3235 | lock_num_exmode_failed(lockres), | |
3236 | lock_total_prmode(lockres), | |
3237 | lock_total_exmode(lockres), | |
3238 | lock_max_prmode(lockres), | |
3239 | lock_max_exmode(lockres), | |
8a7f5f4c GH |
3240 | lock_refresh(lockres), |
3241 | lock_last_prmode(lockres), | |
5da844a2 GH |
3242 | lock_last_exmode(lockres), |
3243 | lock_wait(lockres)); | |
8ddb7b00 | 3244 | |
ccd979bd MF |
3245 | /* End the line */ |
3246 | seq_printf(m, "\n"); | |
3247 | return 0; | |
3248 | } | |
3249 | ||
90d99779 | 3250 | static const struct seq_operations ocfs2_dlm_seq_ops = { |
ccd979bd MF |
3251 | .start = ocfs2_dlm_seq_start, |
3252 | .stop = ocfs2_dlm_seq_stop, | |
3253 | .next = ocfs2_dlm_seq_next, | |
3254 | .show = ocfs2_dlm_seq_show, | |
3255 | }; | |
3256 | ||
3257 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) | |
3258 | { | |
33fa1d90 | 3259 | struct seq_file *seq = file->private_data; |
ccd979bd MF |
3260 | struct ocfs2_dlm_seq_priv *priv = seq->private; |
3261 | struct ocfs2_lock_res *res = &priv->p_iter_res; | |
3262 | ||
3263 | ocfs2_remove_lockres_tracking(res); | |
3264 | ocfs2_put_dlm_debug(priv->p_dlm_debug); | |
3265 | return seq_release_private(inode, file); | |
3266 | } | |
3267 | ||
3268 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) | |
3269 | { | |
ccd979bd | 3270 | struct ocfs2_dlm_seq_priv *priv; |
ccd979bd MF |
3271 | struct ocfs2_super *osb; |
3272 | ||
1848cb55 | 3273 | priv = __seq_open_private(file, &ocfs2_dlm_seq_ops, sizeof(*priv)); |
ccd979bd | 3274 | if (!priv) { |
1848cb55 RJ |
3275 | mlog_errno(-ENOMEM); |
3276 | return -ENOMEM; | |
ccd979bd | 3277 | } |
1848cb55 | 3278 | |
8e18e294 | 3279 | osb = inode->i_private; |
ccd979bd MF |
3280 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
3281 | priv->p_dlm_debug = osb->osb_dlm_debug; | |
3282 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); | |
3283 | ||
ccd979bd MF |
3284 | ocfs2_add_lockres_tracking(&priv->p_iter_res, |
3285 | priv->p_dlm_debug); | |
3286 | ||
1848cb55 | 3287 | return 0; |
ccd979bd MF |
3288 | } |
3289 | ||
4b6f5d20 | 3290 | static const struct file_operations ocfs2_dlm_debug_fops = { |
ccd979bd MF |
3291 | .open = ocfs2_dlm_debug_open, |
3292 | .release = ocfs2_dlm_debug_release, | |
3293 | .read = seq_read, | |
3294 | .llseek = seq_lseek, | |
3295 | }; | |
3296 | ||
e581595e | 3297 | static void ocfs2_dlm_init_debug(struct ocfs2_super *osb) |
ccd979bd | 3298 | { |
ccd979bd MF |
3299 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; |
3300 | ||
5e7a3ed9 GKH |
3301 | debugfs_create_file("locking_state", S_IFREG|S_IRUSR, |
3302 | osb->osb_debug_root, osb, &ocfs2_dlm_debug_fops); | |
ccd979bd | 3303 | |
5e7a3ed9 GKH |
3304 | debugfs_create_u32("locking_filter", 0600, osb->osb_debug_root, |
3305 | &dlm_debug->d_filter_secs); | |
b73eba2a | 3306 | ocfs2_get_dlm_debug(dlm_debug); |
ccd979bd MF |
3307 | } |
3308 | ||
3309 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) | |
3310 | { | |
3311 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; | |
3312 | ||
5e7a3ed9 | 3313 | if (dlm_debug) |
ccd979bd | 3314 | ocfs2_put_dlm_debug(dlm_debug); |
ccd979bd MF |
3315 | } |
3316 | ||
3317 | int ocfs2_dlm_init(struct ocfs2_super *osb) | |
3318 | { | |
c271c5c2 | 3319 | int status = 0; |
4670c46d | 3320 | struct ocfs2_cluster_connection *conn = NULL; |
ccd979bd | 3321 | |
0abd6d18 MF |
3322 | if (ocfs2_mount_local(osb)) { |
3323 | osb->node_num = 0; | |
c271c5c2 | 3324 | goto local; |
0abd6d18 | 3325 | } |
c271c5c2 | 3326 | |
e581595e | 3327 | ocfs2_dlm_init_debug(osb); |
ccd979bd | 3328 | |
34d024f8 | 3329 | /* launch downconvert thread */ |
5afc44e2 JQ |
3330 | osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s", |
3331 | osb->uuid_str); | |
34d024f8 MF |
3332 | if (IS_ERR(osb->dc_task)) { |
3333 | status = PTR_ERR(osb->dc_task); | |
3334 | osb->dc_task = NULL; | |
ccd979bd MF |
3335 | mlog_errno(status); |
3336 | goto bail; | |
3337 | } | |
3338 | ||
ccd979bd | 3339 | /* for now, uuid == domain */ |
9c6c877c | 3340 | status = ocfs2_cluster_connect(osb->osb_cluster_stack, |
c74a3bdd GR |
3341 | osb->osb_cluster_name, |
3342 | strlen(osb->osb_cluster_name), | |
9c6c877c | 3343 | osb->uuid_str, |
4670c46d | 3344 | strlen(osb->uuid_str), |
553b5eb9 | 3345 | &lproto, ocfs2_do_node_down, osb, |
4670c46d JB |
3346 | &conn); |
3347 | if (status) { | |
ccd979bd MF |
3348 | mlog_errno(status); |
3349 | goto bail; | |
3350 | } | |
3351 | ||
3e834151 | 3352 | status = ocfs2_cluster_this_node(conn, &osb->node_num); |
0abd6d18 MF |
3353 | if (status < 0) { |
3354 | mlog_errno(status); | |
3355 | mlog(ML_ERROR, | |
3356 | "could not find this host's node number\n"); | |
286eaa95 | 3357 | ocfs2_cluster_disconnect(conn, 0); |
0abd6d18 MF |
3358 | goto bail; |
3359 | } | |
3360 | ||
c271c5c2 | 3361 | local: |
ccd979bd MF |
3362 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
3363 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); | |
4cd9973f | 3364 | ocfs2_nfs_sync_lock_init(osb); |
83273932 | 3365 | ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb); |
ccd979bd | 3366 | |
4670c46d | 3367 | osb->cconn = conn; |
ccd979bd MF |
3368 | bail: |
3369 | if (status < 0) { | |
3370 | ocfs2_dlm_shutdown_debug(osb); | |
34d024f8 MF |
3371 | if (osb->dc_task) |
3372 | kthread_stop(osb->dc_task); | |
ccd979bd MF |
3373 | } |
3374 | ||
ccd979bd MF |
3375 | return status; |
3376 | } | |
3377 | ||
286eaa95 JB |
3378 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb, |
3379 | int hangup_pending) | |
ccd979bd | 3380 | { |
ccd979bd MF |
3381 | ocfs2_drop_osb_locks(osb); |
3382 | ||
4670c46d JB |
3383 | /* |
3384 | * Now that we have dropped all locks and ocfs2_dismount_volume() | |
3385 | * has disabled recovery, the DLM won't be talking to us. It's | |
3386 | * safe to tear things down before disconnecting the cluster. | |
3387 | */ | |
3388 | ||
34d024f8 MF |
3389 | if (osb->dc_task) { |
3390 | kthread_stop(osb->dc_task); | |
3391 | osb->dc_task = NULL; | |
ccd979bd MF |
3392 | } |
3393 | ||
3394 | ocfs2_lock_res_free(&osb->osb_super_lockres); | |
3395 | ocfs2_lock_res_free(&osb->osb_rename_lockres); | |
6ca497a8 | 3396 | ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres); |
83273932 | 3397 | ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres); |
ccd979bd | 3398 | |
286eaa95 | 3399 | ocfs2_cluster_disconnect(osb->cconn, hangup_pending); |
4670c46d | 3400 | osb->cconn = NULL; |
ccd979bd MF |
3401 | |
3402 | ocfs2_dlm_shutdown_debug(osb); | |
ccd979bd MF |
3403 | } |
3404 | ||
ccd979bd | 3405 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
0d5dc6c2 | 3406 | struct ocfs2_lock_res *lockres) |
ccd979bd | 3407 | { |
7431cd7e | 3408 | int ret; |
ccd979bd | 3409 | unsigned long flags; |
bd3e7610 | 3410 | u32 lkm_flags = 0; |
ccd979bd MF |
3411 | |
3412 | /* We didn't get anywhere near actually using this lockres. */ | |
3413 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) | |
3414 | goto out; | |
3415 | ||
b80fc012 | 3416 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
bd3e7610 | 3417 | lkm_flags |= DLM_LKF_VALBLK; |
b80fc012 | 3418 | |
ccd979bd MF |
3419 | spin_lock_irqsave(&lockres->l_lock, flags); |
3420 | ||
3421 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), | |
3422 | "lockres %s, flags 0x%lx\n", | |
3423 | lockres->l_name, lockres->l_flags); | |
3424 | ||
3425 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { | |
3426 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " | |
3427 | "%u, unlock_action = %u\n", | |
3428 | lockres->l_name, lockres->l_flags, lockres->l_action, | |
3429 | lockres->l_unlock_action); | |
3430 | ||
3431 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3432 | ||
3433 | /* XXX: Today we just wait on any busy | |
3434 | * locks... Perhaps we need to cancel converts in the | |
3435 | * future? */ | |
3436 | ocfs2_wait_on_busy_lock(lockres); | |
3437 | ||
3438 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3439 | } | |
3440 | ||
0d5dc6c2 MF |
3441 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
3442 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && | |
bd3e7610 | 3443 | lockres->l_level == DLM_LOCK_EX && |
0d5dc6c2 MF |
3444 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
3445 | lockres->l_ops->set_lvb(lockres); | |
3446 | } | |
ccd979bd MF |
3447 | |
3448 | if (lockres->l_flags & OCFS2_LOCK_BUSY) | |
3449 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", | |
3450 | lockres->l_name); | |
3451 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) | |
3452 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); | |
3453 | ||
3454 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { | |
3455 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3456 | goto out; | |
3457 | } | |
3458 | ||
3459 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); | |
3460 | ||
3461 | /* make sure we never get here while waiting for an ast to | |
3462 | * fire. */ | |
3463 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); | |
3464 | ||
3465 | /* is this necessary? */ | |
3466 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
3467 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; | |
3468 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3469 | ||
3470 | mlog(0, "lock %s\n", lockres->l_name); | |
3471 | ||
a796d286 | 3472 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags); |
7431cd7e JB |
3473 | if (ret) { |
3474 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd | 3475 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
cf0acdcd | 3476 | ocfs2_dlm_dump_lksb(&lockres->l_lksb); |
ccd979bd MF |
3477 | BUG(); |
3478 | } | |
73ac36ea | 3479 | mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n", |
ccd979bd MF |
3480 | lockres->l_name); |
3481 | ||
3482 | ocfs2_wait_on_busy_lock(lockres); | |
3483 | out: | |
ccd979bd MF |
3484 | return 0; |
3485 | } | |
3486 | ||
84d86f83 JK |
3487 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
3488 | struct ocfs2_lock_res *lockres); | |
3489 | ||
ccd979bd MF |
3490 | /* Mark the lockres as being dropped. It will no longer be |
3491 | * queued if blocking, but we still may have to wait on it | |
34d024f8 | 3492 | * being dequeued from the downconvert thread before we can consider |
2bd63216 | 3493 | * it safe to drop. |
ccd979bd MF |
3494 | * |
3495 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ | |
84d86f83 JK |
3496 | void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb, |
3497 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
3498 | { |
3499 | int status; | |
3500 | struct ocfs2_mask_waiter mw; | |
84d86f83 | 3501 | unsigned long flags, flags2; |
ccd979bd MF |
3502 | |
3503 | ocfs2_init_mask_waiter(&mw); | |
3504 | ||
3505 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3506 | lockres->l_flags |= OCFS2_LOCK_FREEING; | |
84d86f83 JK |
3507 | if (lockres->l_flags & OCFS2_LOCK_QUEUED && current == osb->dc_task) { |
3508 | /* | |
3509 | * We know the downconvert is queued but not in progress | |
3510 | * because we are the downconvert thread and processing | |
3511 | * different lock. So we can just remove the lock from the | |
3512 | * queue. This is not only an optimization but also a way | |
3513 | * to avoid the following deadlock: | |
3514 | * ocfs2_dentry_post_unlock() | |
3515 | * ocfs2_dentry_lock_put() | |
3516 | * ocfs2_drop_dentry_lock() | |
3517 | * iput() | |
3518 | * ocfs2_evict_inode() | |
3519 | * ocfs2_clear_inode() | |
3520 | * ocfs2_mark_lockres_freeing() | |
3521 | * ... blocks waiting for OCFS2_LOCK_QUEUED | |
3522 | * since we are the downconvert thread which | |
3523 | * should clear the flag. | |
3524 | */ | |
3525 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3526 | spin_lock_irqsave(&osb->dc_task_lock, flags2); | |
3527 | list_del_init(&lockres->l_blocked_list); | |
3528 | osb->blocked_lock_count--; | |
3529 | spin_unlock_irqrestore(&osb->dc_task_lock, flags2); | |
3530 | /* | |
3531 | * Warn if we recurse into another post_unlock call. Strictly | |
3532 | * speaking it isn't a problem but we need to be careful if | |
3533 | * that happens (stack overflow, deadlocks, ...) so warn if | |
3534 | * ocfs2 grows a path for which this can happen. | |
3535 | */ | |
3536 | WARN_ON_ONCE(lockres->l_ops->post_unlock); | |
3537 | /* Since the lock is freeing we don't do much in the fn below */ | |
3538 | ocfs2_process_blocked_lock(osb, lockres); | |
3539 | return; | |
3540 | } | |
ccd979bd MF |
3541 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { |
3542 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); | |
3543 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3544 | ||
3545 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); | |
3546 | ||
3547 | status = ocfs2_wait_for_mask(&mw); | |
3548 | if (status) | |
3549 | mlog_errno(status); | |
3550 | ||
3551 | spin_lock_irqsave(&lockres->l_lock, flags); | |
3552 | } | |
3553 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3554 | } | |
3555 | ||
d680efe9 MF |
3556 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
3557 | struct ocfs2_lock_res *lockres) | |
ccd979bd | 3558 | { |
d680efe9 | 3559 | int ret; |
ccd979bd | 3560 | |
84d86f83 | 3561 | ocfs2_mark_lockres_freeing(osb, lockres); |
0d5dc6c2 | 3562 | ret = ocfs2_drop_lock(osb, lockres); |
d680efe9 MF |
3563 | if (ret) |
3564 | mlog_errno(ret); | |
3565 | } | |
ccd979bd | 3566 | |
d680efe9 MF |
3567 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
3568 | { | |
3569 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); | |
3570 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); | |
6ca497a8 | 3571 | ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres); |
83273932 | 3572 | ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres); |
ccd979bd MF |
3573 | } |
3574 | ||
ccd979bd MF |
3575 | int ocfs2_drop_inode_locks(struct inode *inode) |
3576 | { | |
3577 | int status, err; | |
ccd979bd | 3578 | |
ccd979bd MF |
3579 | /* No need to call ocfs2_mark_lockres_freeing here - |
3580 | * ocfs2_clear_inode has done it for us. */ | |
3581 | ||
3582 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
50008630 | 3583 | &OCFS2_I(inode)->ip_open_lockres); |
ccd979bd MF |
3584 | if (err < 0) |
3585 | mlog_errno(err); | |
3586 | ||
3587 | status = err; | |
3588 | ||
3589 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
e63aecb6 | 3590 | &OCFS2_I(inode)->ip_inode_lockres); |
ccd979bd MF |
3591 | if (err < 0) |
3592 | mlog_errno(err); | |
3593 | if (err < 0 && !status) | |
3594 | status = err; | |
3595 | ||
3596 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), | |
0d5dc6c2 | 3597 | &OCFS2_I(inode)->ip_rw_lockres); |
ccd979bd MF |
3598 | if (err < 0) |
3599 | mlog_errno(err); | |
3600 | if (err < 0 && !status) | |
3601 | status = err; | |
3602 | ||
ccd979bd MF |
3603 | return status; |
3604 | } | |
3605 | ||
de551246 JB |
3606 | static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
3607 | int new_level) | |
ccd979bd MF |
3608 | { |
3609 | assert_spin_locked(&lockres->l_lock); | |
3610 | ||
bd3e7610 | 3611 | BUG_ON(lockres->l_blocking <= DLM_LOCK_NL); |
ccd979bd MF |
3612 | |
3613 | if (lockres->l_level <= new_level) { | |
9b915181 SM |
3614 | mlog(ML_ERROR, "lockres %s, lvl %d <= %d, blcklst %d, mask %d, " |
3615 | "type %d, flags 0x%lx, hold %d %d, act %d %d, req %d, " | |
3616 | "block %d, pgen %d\n", lockres->l_name, lockres->l_level, | |
3617 | new_level, list_empty(&lockres->l_blocked_list), | |
3618 | list_empty(&lockres->l_mask_waiters), lockres->l_type, | |
3619 | lockres->l_flags, lockres->l_ro_holders, | |
3620 | lockres->l_ex_holders, lockres->l_action, | |
3621 | lockres->l_unlock_action, lockres->l_requested, | |
3622 | lockres->l_blocking, lockres->l_pending_gen); | |
ccd979bd MF |
3623 | BUG(); |
3624 | } | |
3625 | ||
9b915181 SM |
3626 | mlog(ML_BASTS, "lockres %s, level %d => %d, blocking %d\n", |
3627 | lockres->l_name, lockres->l_level, new_level, lockres->l_blocking); | |
ccd979bd MF |
3628 | |
3629 | lockres->l_action = OCFS2_AST_DOWNCONVERT; | |
3630 | lockres->l_requested = new_level; | |
3631 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); | |
de551246 | 3632 | return lockres_set_pending(lockres); |
ccd979bd MF |
3633 | } |
3634 | ||
3635 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, | |
3636 | struct ocfs2_lock_res *lockres, | |
3637 | int new_level, | |
de551246 JB |
3638 | int lvb, |
3639 | unsigned int generation) | |
ccd979bd | 3640 | { |
bd3e7610 JB |
3641 | int ret; |
3642 | u32 dlm_flags = DLM_LKF_CONVERT; | |
ccd979bd | 3643 | |
9b915181 SM |
3644 | mlog(ML_BASTS, "lockres %s, level %d => %d\n", lockres->l_name, |
3645 | lockres->l_level, new_level); | |
3646 | ||
e7ee2c08 ER |
3647 | /* |
3648 | * On DLM_LKF_VALBLK, fsdlm behaves differently with o2cb. It always | |
3649 | * expects DLM_LKF_VALBLK being set if the LKB has LVB, so that | |
3650 | * we can recover correctly from node failure. Otherwise, we may get | |
793057e1 | 3651 | * invalid LVB in LKB, but without DLM_SBF_VALNOTVALID being set. |
e7ee2c08 | 3652 | */ |
a6346447 | 3653 | if (ocfs2_userspace_stack(osb) && |
e7ee2c08 ER |
3654 | lockres->l_ops->flags & LOCK_TYPE_USES_LVB) |
3655 | lvb = 1; | |
3656 | ||
ccd979bd | 3657 | if (lvb) |
bd3e7610 | 3658 | dlm_flags |= DLM_LKF_VALBLK; |
ccd979bd | 3659 | |
4670c46d | 3660 | ret = ocfs2_dlm_lock(osb->cconn, |
7431cd7e JB |
3661 | new_level, |
3662 | &lockres->l_lksb, | |
3663 | dlm_flags, | |
3664 | lockres->l_name, | |
a796d286 | 3665 | OCFS2_LOCK_ID_MAX_LEN - 1); |
de551246 | 3666 | lockres_clear_pending(lockres, generation, osb); |
7431cd7e JB |
3667 | if (ret) { |
3668 | ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres); | |
ccd979bd MF |
3669 | ocfs2_recover_from_dlm_error(lockres, 1); |
3670 | goto bail; | |
3671 | } | |
3672 | ||
3673 | ret = 0; | |
3674 | bail: | |
ccd979bd MF |
3675 | return ret; |
3676 | } | |
3677 | ||
24ef1815 | 3678 | /* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */ |
ccd979bd MF |
3679 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
3680 | struct ocfs2_lock_res *lockres) | |
3681 | { | |
3682 | assert_spin_locked(&lockres->l_lock); | |
3683 | ||
ccd979bd MF |
3684 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
3685 | /* If we're already trying to cancel a lock conversion | |
3686 | * then just drop the spinlock and allow the caller to | |
3687 | * requeue this lock. */ | |
9b915181 | 3688 | mlog(ML_BASTS, "lockres %s, skip convert\n", lockres->l_name); |
ccd979bd MF |
3689 | return 0; |
3690 | } | |
3691 | ||
3692 | /* were we in a convert when we got the bast fire? */ | |
3693 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && | |
3694 | lockres->l_action != OCFS2_AST_DOWNCONVERT); | |
3695 | /* set things up for the unlockast to know to just | |
3696 | * clear out the ast_action and unset busy, etc. */ | |
3697 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; | |
3698 | ||
3699 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), | |
3700 | "lock %s, invalid flags: 0x%lx\n", | |
3701 | lockres->l_name, lockres->l_flags); | |
3702 | ||
9b915181 SM |
3703 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
3704 | ||
ccd979bd MF |
3705 | return 1; |
3706 | } | |
3707 | ||
3708 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, | |
3709 | struct ocfs2_lock_res *lockres) | |
3710 | { | |
3711 | int ret; | |
ccd979bd | 3712 | |
4670c46d | 3713 | ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, |
a796d286 | 3714 | DLM_LKF_CANCEL); |
7431cd7e JB |
3715 | if (ret) { |
3716 | ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres); | |
ccd979bd MF |
3717 | ocfs2_recover_from_dlm_error(lockres, 0); |
3718 | } | |
3719 | ||
9b915181 | 3720 | mlog(ML_BASTS, "lockres %s\n", lockres->l_name); |
ccd979bd | 3721 | |
ccd979bd MF |
3722 | return ret; |
3723 | } | |
3724 | ||
b5e500e2 MF |
3725 | static int ocfs2_unblock_lock(struct ocfs2_super *osb, |
3726 | struct ocfs2_lock_res *lockres, | |
3727 | struct ocfs2_unblock_ctl *ctl) | |
ccd979bd MF |
3728 | { |
3729 | unsigned long flags; | |
3730 | int blocking; | |
3731 | int new_level; | |
079b8057 | 3732 | int level; |
ccd979bd | 3733 | int ret = 0; |
5ef0d4ea | 3734 | int set_lvb = 0; |
de551246 | 3735 | unsigned int gen; |
ccd979bd | 3736 | |
ccd979bd MF |
3737 | spin_lock_irqsave(&lockres->l_lock, flags); |
3738 | ||
ccd979bd | 3739 | recheck: |
db0f6ce6 SM |
3740 | /* |
3741 | * Is it still blocking? If not, we have no more work to do. | |
3742 | */ | |
3743 | if (!(lockres->l_flags & OCFS2_LOCK_BLOCKED)) { | |
3744 | BUG_ON(lockres->l_blocking != DLM_LOCK_NL); | |
3745 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3746 | ret = 0; | |
3747 | goto leave; | |
3748 | } | |
3749 | ||
ccd979bd | 3750 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
de551246 JB |
3751 | /* XXX |
3752 | * This is a *big* race. The OCFS2_LOCK_PENDING flag | |
3753 | * exists entirely for one reason - another thread has set | |
3754 | * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock(). | |
3755 | * | |
3756 | * If we do ocfs2_cancel_convert() before the other thread | |
3757 | * calls dlm_lock(), our cancel will do nothing. We will | |
3758 | * get no ast, and we will have no way of knowing the | |
3759 | * cancel failed. Meanwhile, the other thread will call | |
3760 | * into dlm_lock() and wait...forever. | |
3761 | * | |
3762 | * Why forever? Because another node has asked for the | |
3763 | * lock first; that's why we're here in unblock_lock(). | |
3764 | * | |
3765 | * The solution is OCFS2_LOCK_PENDING. When PENDING is | |
3766 | * set, we just requeue the unblock. Only when the other | |
3767 | * thread has called dlm_lock() and cleared PENDING will | |
3768 | * we then cancel their request. | |
3769 | * | |
3770 | * All callers of dlm_lock() must set OCFS2_DLM_PENDING | |
3771 | * at the same time they set OCFS2_DLM_BUSY. They must | |
3772 | * clear OCFS2_DLM_PENDING after dlm_lock() returns. | |
3773 | */ | |
9b915181 SM |
3774 | if (lockres->l_flags & OCFS2_LOCK_PENDING) { |
3775 | mlog(ML_BASTS, "lockres %s, ReQ: Pending\n", | |
3776 | lockres->l_name); | |
de551246 | 3777 | goto leave_requeue; |
9b915181 | 3778 | } |
de551246 | 3779 | |
d680efe9 | 3780 | ctl->requeue = 1; |
ccd979bd MF |
3781 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
3782 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3783 | if (ret) { | |
3784 | ret = ocfs2_cancel_convert(osb, lockres); | |
3785 | if (ret < 0) | |
3786 | mlog_errno(ret); | |
3787 | } | |
3788 | goto leave; | |
3789 | } | |
3790 | ||
a1912826 SM |
3791 | /* |
3792 | * This prevents livelocks. OCFS2_LOCK_UPCONVERT_FINISHING flag is | |
3793 | * set when the ast is received for an upconvert just before the | |
3794 | * OCFS2_LOCK_BUSY flag is cleared. Now if the fs received a bast | |
3795 | * on the heels of the ast, we want to delay the downconvert just | |
3796 | * enough to allow the up requestor to do its task. Because this | |
3797 | * lock is in the blocked queue, the lock will be downconverted | |
3798 | * as soon as the requestor is done with the lock. | |
3799 | */ | |
3800 | if (lockres->l_flags & OCFS2_LOCK_UPCONVERT_FINISHING) | |
3801 | goto leave_requeue; | |
3802 | ||
0d74125a SM |
3803 | /* |
3804 | * How can we block and yet be at NL? We were trying to upconvert | |
3805 | * from NL and got canceled. The code comes back here, and now | |
3806 | * we notice and clear BLOCKING. | |
3807 | */ | |
3808 | if (lockres->l_level == DLM_LOCK_NL) { | |
3809 | BUG_ON(lockres->l_ex_holders || lockres->l_ro_holders); | |
9b915181 | 3810 | mlog(ML_BASTS, "lockres %s, Aborting dc\n", lockres->l_name); |
0d74125a SM |
3811 | lockres->l_blocking = DLM_LOCK_NL; |
3812 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); | |
3813 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3814 | goto leave; | |
3815 | } | |
3816 | ||
ccd979bd MF |
3817 | /* if we're blocking an exclusive and we have *any* holders, |
3818 | * then requeue. */ | |
bd3e7610 | 3819 | if ((lockres->l_blocking == DLM_LOCK_EX) |
9b915181 SM |
3820 | && (lockres->l_ex_holders || lockres->l_ro_holders)) { |
3821 | mlog(ML_BASTS, "lockres %s, ReQ: EX/PR Holders %u,%u\n", | |
3822 | lockres->l_name, lockres->l_ex_holders, | |
3823 | lockres->l_ro_holders); | |
f7fbfdd1 | 3824 | goto leave_requeue; |
9b915181 | 3825 | } |
ccd979bd MF |
3826 | |
3827 | /* If it's a PR we're blocking, then only | |
3828 | * requeue if we've got any EX holders */ | |
bd3e7610 | 3829 | if (lockres->l_blocking == DLM_LOCK_PR && |
9b915181 SM |
3830 | lockres->l_ex_holders) { |
3831 | mlog(ML_BASTS, "lockres %s, ReQ: EX Holders %u\n", | |
3832 | lockres->l_name, lockres->l_ex_holders); | |
f7fbfdd1 | 3833 | goto leave_requeue; |
9b915181 | 3834 | } |
f7fbfdd1 MF |
3835 | |
3836 | /* | |
3837 | * Can we get a lock in this state if the holder counts are | |
3838 | * zero? The meta data unblock code used to check this. | |
3839 | */ | |
3840 | if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) | |
9b915181 SM |
3841 | && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) { |
3842 | mlog(ML_BASTS, "lockres %s, ReQ: Lock Refreshing\n", | |
3843 | lockres->l_name); | |
f7fbfdd1 | 3844 | goto leave_requeue; |
9b915181 | 3845 | } |
ccd979bd | 3846 | |
16d5b956 MF |
3847 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
3848 | ||
3849 | if (lockres->l_ops->check_downconvert | |
9b915181 SM |
3850 | && !lockres->l_ops->check_downconvert(lockres, new_level)) { |
3851 | mlog(ML_BASTS, "lockres %s, ReQ: Checkpointing\n", | |
3852 | lockres->l_name); | |
16d5b956 | 3853 | goto leave_requeue; |
9b915181 | 3854 | } |
16d5b956 | 3855 | |
ccd979bd MF |
3856 | /* If we get here, then we know that there are no more |
3857 | * incompatible holders (and anyone asking for an incompatible | |
3858 | * lock is blocked). We can now downconvert the lock */ | |
cc567d89 | 3859 | if (!lockres->l_ops->downconvert_worker) |
ccd979bd MF |
3860 | goto downconvert; |
3861 | ||
3862 | /* Some lockres types want to do a bit of work before | |
3863 | * downconverting a lock. Allow that here. The worker function | |
3864 | * may sleep, so we save off a copy of what we're blocking as | |
3865 | * it may change while we're not holding the spin lock. */ | |
3866 | blocking = lockres->l_blocking; | |
079b8057 | 3867 | level = lockres->l_level; |
ccd979bd MF |
3868 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
3869 | ||
cc567d89 | 3870 | ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); |
d680efe9 | 3871 | |
9b915181 SM |
3872 | if (ctl->unblock_action == UNBLOCK_STOP_POST) { |
3873 | mlog(ML_BASTS, "lockres %s, UNBLOCK_STOP_POST\n", | |
3874 | lockres->l_name); | |
d680efe9 | 3875 | goto leave; |
9b915181 | 3876 | } |
ccd979bd MF |
3877 | |
3878 | spin_lock_irqsave(&lockres->l_lock, flags); | |
079b8057 | 3879 | if ((blocking != lockres->l_blocking) || (level != lockres->l_level)) { |
ccd979bd MF |
3880 | /* If this changed underneath us, then we can't drop |
3881 | * it just yet. */ | |
9b915181 SM |
3882 | mlog(ML_BASTS, "lockres %s, block=%d:%d, level=%d:%d, " |
3883 | "Recheck\n", lockres->l_name, blocking, | |
3884 | lockres->l_blocking, level, lockres->l_level); | |
ccd979bd MF |
3885 | goto recheck; |
3886 | } | |
3887 | ||
3888 | downconvert: | |
d680efe9 | 3889 | ctl->requeue = 0; |
ccd979bd | 3890 | |
5ef0d4ea | 3891 | if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { |
bd3e7610 | 3892 | if (lockres->l_level == DLM_LOCK_EX) |
5ef0d4ea MF |
3893 | set_lvb = 1; |
3894 | ||
3895 | /* | |
3896 | * We only set the lvb if the lock has been fully | |
3897 | * refreshed - otherwise we risk setting stale | |
3898 | * data. Otherwise, there's no need to actually clear | |
3899 | * out the lvb here as it's value is still valid. | |
3900 | */ | |
3901 | if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) | |
3902 | lockres->l_ops->set_lvb(lockres); | |
3903 | } | |
3904 | ||
de551246 | 3905 | gen = ocfs2_prepare_downconvert(lockres, new_level); |
ccd979bd | 3906 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
de551246 JB |
3907 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb, |
3908 | gen); | |
3909 | ||
ccd979bd | 3910 | leave: |
c1e8d35e TM |
3911 | if (ret) |
3912 | mlog_errno(ret); | |
ccd979bd | 3913 | return ret; |
f7fbfdd1 MF |
3914 | |
3915 | leave_requeue: | |
3916 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
3917 | ctl->requeue = 1; | |
3918 | ||
f7fbfdd1 | 3919 | return 0; |
ccd979bd MF |
3920 | } |
3921 | ||
d680efe9 MF |
3922 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
3923 | int blocking) | |
ccd979bd MF |
3924 | { |
3925 | struct inode *inode; | |
3926 | struct address_space *mapping; | |
5e98d492 | 3927 | struct ocfs2_inode_info *oi; |
ccd979bd | 3928 | |
ccd979bd MF |
3929 | inode = ocfs2_lock_res_inode(lockres); |
3930 | mapping = inode->i_mapping; | |
3931 | ||
5e98d492 GR |
3932 | if (S_ISDIR(inode->i_mode)) { |
3933 | oi = OCFS2_I(inode); | |
3934 | oi->ip_dir_lock_gen++; | |
3935 | mlog(0, "generation: %u\n", oi->ip_dir_lock_gen); | |
3936 | goto out; | |
3937 | } | |
3938 | ||
1044e401 | 3939 | if (!S_ISREG(inode->i_mode)) |
f1f54068 MF |
3940 | goto out; |
3941 | ||
7f4a2a97 MF |
3942 | /* |
3943 | * We need this before the filemap_fdatawrite() so that it can | |
3944 | * transfer the dirty bit from the PTE to the | |
3945 | * page. Unfortunately this means that even for EX->PR | |
3946 | * downconverts, we'll lose our mappings and have to build | |
3947 | * them up again. | |
3948 | */ | |
3949 | unmap_mapping_range(mapping, 0, 0, 0); | |
3950 | ||
ccd979bd | 3951 | if (filemap_fdatawrite(mapping)) { |
b0697053 MF |
3952 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
3953 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
3954 | } |
3955 | sync_mapping_buffers(mapping); | |
bd3e7610 | 3956 | if (blocking == DLM_LOCK_EX) { |
ccd979bd | 3957 | truncate_inode_pages(mapping, 0); |
ccd979bd MF |
3958 | } else { |
3959 | /* We only need to wait on the I/O if we're not also | |
3960 | * truncating pages because truncate_inode_pages waits | |
3961 | * for us above. We don't truncate pages if we're | |
3962 | * blocking anything < EXMODE because we want to keep | |
3963 | * them around in that case. */ | |
3964 | filemap_fdatawait(mapping); | |
3965 | } | |
3966 | ||
b8a7a3a6 AG |
3967 | forget_all_cached_acls(inode); |
3968 | ||
f1f54068 | 3969 | out: |
d680efe9 | 3970 | return UNBLOCK_CONTINUE; |
ccd979bd MF |
3971 | } |
3972 | ||
a4338481 TM |
3973 | static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci, |
3974 | struct ocfs2_lock_res *lockres, | |
3975 | int new_level) | |
810d5aeb | 3976 | { |
a4338481 | 3977 | int checkpointed = ocfs2_ci_fully_checkpointed(ci); |
810d5aeb | 3978 | |
bd3e7610 JB |
3979 | BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR); |
3980 | BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed); | |
810d5aeb MF |
3981 | |
3982 | if (checkpointed) | |
3983 | return 1; | |
3984 | ||
a4338481 | 3985 | ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci))); |
810d5aeb MF |
3986 | return 0; |
3987 | } | |
3988 | ||
a4338481 TM |
3989 | static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, |
3990 | int new_level) | |
3991 | { | |
3992 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
3993 | ||
3994 | return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level); | |
3995 | } | |
3996 | ||
810d5aeb MF |
3997 | static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) |
3998 | { | |
3999 | struct inode *inode = ocfs2_lock_res_inode(lockres); | |
4000 | ||
4001 | __ocfs2_stuff_meta_lvb(inode); | |
4002 | } | |
4003 | ||
d680efe9 MF |
4004 | /* |
4005 | * Does the final reference drop on our dentry lock. Right now this | |
34d024f8 | 4006 | * happens in the downconvert thread, but we could choose to simplify the |
d680efe9 MF |
4007 | * dlmglue API and push these off to the ocfs2_wq in the future. |
4008 | */ | |
4009 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, | |
4010 | struct ocfs2_lock_res *lockres) | |
4011 | { | |
4012 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
4013 | ocfs2_dentry_lock_put(osb, dl); | |
4014 | } | |
4015 | ||
4016 | /* | |
4017 | * d_delete() matching dentries before the lock downconvert. | |
4018 | * | |
4019 | * At this point, any process waiting to destroy the | |
4020 | * dentry_lock due to last ref count is stopped by the | |
4021 | * OCFS2_LOCK_QUEUED flag. | |
4022 | * | |
4023 | * We have two potential problems | |
4024 | * | |
4025 | * 1) If we do the last reference drop on our dentry_lock (via dput) | |
4026 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on | |
4027 | * the downconvert to finish. Instead we take an elevated | |
4028 | * reference and push the drop until after we've completed our | |
4029 | * unblock processing. | |
4030 | * | |
4031 | * 2) There might be another process with a final reference, | |
4032 | * waiting on us to finish processing. If this is the case, we | |
4033 | * detect it and exit out - there's no more dentries anyway. | |
4034 | */ | |
4035 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, | |
4036 | int blocking) | |
4037 | { | |
4038 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); | |
4039 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); | |
4040 | struct dentry *dentry; | |
4041 | unsigned long flags; | |
4042 | int extra_ref = 0; | |
4043 | ||
4044 | /* | |
4045 | * This node is blocking another node from getting a read | |
4046 | * lock. This happens when we've renamed within a | |
4047 | * directory. We've forced the other nodes to d_delete(), but | |
4048 | * we never actually dropped our lock because it's still | |
4049 | * valid. The downconvert code will retain a PR for this node, | |
4050 | * so there's no further work to do. | |
4051 | */ | |
bd3e7610 | 4052 | if (blocking == DLM_LOCK_PR) |
d680efe9 MF |
4053 | return UNBLOCK_CONTINUE; |
4054 | ||
4055 | /* | |
4056 | * Mark this inode as potentially orphaned. The code in | |
4057 | * ocfs2_delete_inode() will figure out whether it actually | |
4058 | * needs to be freed or not. | |
4059 | */ | |
4060 | spin_lock(&oi->ip_lock); | |
4061 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; | |
4062 | spin_unlock(&oi->ip_lock); | |
4063 | ||
4064 | /* | |
4065 | * Yuck. We need to make sure however that the check of | |
4066 | * OCFS2_LOCK_FREEING and the extra reference are atomic with | |
4067 | * respect to a reference decrement or the setting of that | |
4068 | * flag. | |
4069 | */ | |
4070 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4071 | spin_lock(&dentry_attach_lock); | |
4072 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) | |
4073 | && dl->dl_count) { | |
4074 | dl->dl_count++; | |
4075 | extra_ref = 1; | |
4076 | } | |
4077 | spin_unlock(&dentry_attach_lock); | |
4078 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
4079 | ||
4080 | mlog(0, "extra_ref = %d\n", extra_ref); | |
4081 | ||
4082 | /* | |
4083 | * We have a process waiting on us in ocfs2_dentry_iput(), | |
4084 | * which means we can't have any more outstanding | |
4085 | * aliases. There's no need to do any more work. | |
4086 | */ | |
4087 | if (!extra_ref) | |
4088 | return UNBLOCK_CONTINUE; | |
4089 | ||
4090 | spin_lock(&dentry_attach_lock); | |
4091 | while (1) { | |
4092 | dentry = ocfs2_find_local_alias(dl->dl_inode, | |
4093 | dl->dl_parent_blkno, 1); | |
4094 | if (!dentry) | |
4095 | break; | |
4096 | spin_unlock(&dentry_attach_lock); | |
4097 | ||
10ab8811 | 4098 | if (S_ISDIR(dl->dl_inode->i_mode)) |
4099 | shrink_dcache_parent(dentry); | |
4100 | ||
a455589f | 4101 | mlog(0, "d_delete(%pd);\n", dentry); |
d680efe9 MF |
4102 | |
4103 | /* | |
4104 | * The following dcache calls may do an | |
4105 | * iput(). Normally we don't want that from the | |
4106 | * downconverting thread, but in this case it's ok | |
4107 | * because the requesting node already has an | |
4108 | * exclusive lock on the inode, so it can't be queued | |
4109 | * for a downconvert. | |
4110 | */ | |
4111 | d_delete(dentry); | |
4112 | dput(dentry); | |
4113 | ||
4114 | spin_lock(&dentry_attach_lock); | |
4115 | } | |
4116 | spin_unlock(&dentry_attach_lock); | |
4117 | ||
4118 | /* | |
4119 | * If we are the last holder of this dentry lock, there is no | |
4120 | * reason to downconvert so skip straight to the unlock. | |
4121 | */ | |
4122 | if (dl->dl_count == 1) | |
4123 | return UNBLOCK_STOP_POST; | |
4124 | ||
4125 | return UNBLOCK_CONTINUE_POST; | |
4126 | } | |
4127 | ||
8dec98ed TM |
4128 | static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres, |
4129 | int new_level) | |
4130 | { | |
4131 | struct ocfs2_refcount_tree *tree = | |
4132 | ocfs2_lock_res_refcount_tree(lockres); | |
4133 | ||
4134 | return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level); | |
4135 | } | |
4136 | ||
4137 | static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres, | |
4138 | int blocking) | |
4139 | { | |
4140 | struct ocfs2_refcount_tree *tree = | |
4141 | ocfs2_lock_res_refcount_tree(lockres); | |
4142 | ||
4143 | ocfs2_metadata_cache_purge(&tree->rf_ci); | |
4144 | ||
4145 | return UNBLOCK_CONTINUE; | |
4146 | } | |
4147 | ||
9e33d69f JK |
4148 | static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres) |
4149 | { | |
4150 | struct ocfs2_qinfo_lvb *lvb; | |
4151 | struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres); | |
4152 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
4153 | oinfo->dqi_gi.dqi_type); | |
4154 | ||
a641dc2a | 4155 | lvb = ocfs2_dlm_lvb(&lockres->l_lksb); |
9e33d69f JK |
4156 | lvb->lvb_version = OCFS2_QINFO_LVB_VERSION; |
4157 | lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace); | |
4158 | lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace); | |
4159 | lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms); | |
4160 | lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks); | |
4161 | lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk); | |
4162 | lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry); | |
9e33d69f JK |
4163 | } |
4164 | ||
4165 | void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
4166 | { | |
4167 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4168 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
4169 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4170 | ||
9e33d69f JK |
4171 | if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) |
4172 | ocfs2_cluster_unlock(osb, lockres, level); | |
9e33d69f JK |
4173 | } |
4174 | ||
4175 | static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo) | |
4176 | { | |
4177 | struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb, | |
4178 | oinfo->dqi_gi.dqi_type); | |
4179 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4180 | struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb); | |
85eb8b73 | 4181 | struct buffer_head *bh = NULL; |
9e33d69f JK |
4182 | struct ocfs2_global_disk_dqinfo *gdinfo; |
4183 | int status = 0; | |
4184 | ||
1c520dfb JB |
4185 | if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) && |
4186 | lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) { | |
9e33d69f JK |
4187 | info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace); |
4188 | info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace); | |
4189 | oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms); | |
4190 | oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks); | |
4191 | oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk); | |
4192 | oinfo->dqi_gi.dqi_free_entry = | |
4193 | be32_to_cpu(lvb->lvb_free_entry); | |
4194 | } else { | |
ae4f6ef1 JK |
4195 | status = ocfs2_read_quota_phys_block(oinfo->dqi_gqinode, |
4196 | oinfo->dqi_giblk, &bh); | |
85eb8b73 | 4197 | if (status) { |
9e33d69f JK |
4198 | mlog_errno(status); |
4199 | goto bail; | |
4200 | } | |
4201 | gdinfo = (struct ocfs2_global_disk_dqinfo *) | |
4202 | (bh->b_data + OCFS2_GLOBAL_INFO_OFF); | |
4203 | info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace); | |
4204 | info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace); | |
4205 | oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms); | |
4206 | oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks); | |
4207 | oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk); | |
4208 | oinfo->dqi_gi.dqi_free_entry = | |
4209 | le32_to_cpu(gdinfo->dqi_free_entry); | |
4210 | brelse(bh); | |
4211 | ocfs2_track_lock_refresh(lockres); | |
4212 | } | |
4213 | ||
4214 | bail: | |
4215 | return status; | |
4216 | } | |
4217 | ||
4218 | /* Lock quota info, this function expects at least shared lock on the quota file | |
4219 | * so that we can safely refresh quota info from disk. */ | |
4220 | int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex) | |
4221 | { | |
4222 | struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock; | |
4223 | struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb); | |
4224 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4225 | int status = 0; | |
4226 | ||
9e33d69f JK |
4227 | /* On RO devices, locking really isn't needed... */ |
4228 | if (ocfs2_is_hard_readonly(osb)) { | |
4229 | if (ex) | |
4230 | status = -EROFS; | |
4231 | goto bail; | |
4232 | } | |
4233 | if (ocfs2_mount_local(osb)) | |
4234 | goto bail; | |
4235 | ||
4236 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
4237 | if (status < 0) { | |
4238 | mlog_errno(status); | |
4239 | goto bail; | |
4240 | } | |
4241 | if (!ocfs2_should_refresh_lock_res(lockres)) | |
4242 | goto bail; | |
4243 | /* OK, we have the lock but we need to refresh the quota info */ | |
4244 | status = ocfs2_refresh_qinfo(oinfo); | |
4245 | if (status) | |
4246 | ocfs2_qinfo_unlock(oinfo, ex); | |
4247 | ocfs2_complete_lock_res_refresh(lockres, status); | |
4248 | bail: | |
9e33d69f JK |
4249 | return status; |
4250 | } | |
4251 | ||
8dec98ed TM |
4252 | int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex) |
4253 | { | |
4254 | int status; | |
4255 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4256 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
4257 | struct ocfs2_super *osb = lockres->l_priv; | |
4258 | ||
4259 | ||
4260 | if (ocfs2_is_hard_readonly(osb)) | |
4261 | return -EROFS; | |
4262 | ||
4263 | if (ocfs2_mount_local(osb)) | |
4264 | return 0; | |
4265 | ||
4266 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); | |
4267 | if (status < 0) | |
4268 | mlog_errno(status); | |
4269 | ||
4270 | return status; | |
4271 | } | |
4272 | ||
4273 | void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex) | |
4274 | { | |
4275 | int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR; | |
4276 | struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres; | |
4277 | struct ocfs2_super *osb = lockres->l_priv; | |
4278 | ||
4279 | if (!ocfs2_mount_local(osb)) | |
4280 | ocfs2_cluster_unlock(osb, lockres, level); | |
4281 | } | |
4282 | ||
00600056 AB |
4283 | static void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
4284 | struct ocfs2_lock_res *lockres) | |
ccd979bd MF |
4285 | { |
4286 | int status; | |
d680efe9 | 4287 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
ccd979bd MF |
4288 | unsigned long flags; |
4289 | ||
4290 | /* Our reference to the lockres in this function can be | |
4291 | * considered valid until we remove the OCFS2_LOCK_QUEUED | |
4292 | * flag. */ | |
4293 | ||
ccd979bd MF |
4294 | BUG_ON(!lockres); |
4295 | BUG_ON(!lockres->l_ops); | |
ccd979bd | 4296 | |
9b915181 | 4297 | mlog(ML_BASTS, "lockres %s blocked\n", lockres->l_name); |
ccd979bd MF |
4298 | |
4299 | /* Detect whether a lock has been marked as going away while | |
34d024f8 | 4300 | * the downconvert thread was processing other things. A lock can |
ccd979bd MF |
4301 | * still be marked with OCFS2_LOCK_FREEING after this check, |
4302 | * but short circuiting here will still save us some | |
4303 | * performance. */ | |
4304 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4305 | if (lockres->l_flags & OCFS2_LOCK_FREEING) | |
4306 | goto unqueue; | |
4307 | spin_unlock_irqrestore(&lockres->l_lock, flags); | |
4308 | ||
b5e500e2 | 4309 | status = ocfs2_unblock_lock(osb, lockres, &ctl); |
ccd979bd MF |
4310 | if (status < 0) |
4311 | mlog_errno(status); | |
4312 | ||
4313 | spin_lock_irqsave(&lockres->l_lock, flags); | |
4314 | unqueue: | |
d680efe9 | 4315 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
ccd979bd MF |
4316 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
4317 | } else | |
4318 | ocfs2_schedule_blocked_lock(osb, lockres); | |
4319 | ||
9b915181 | 4320 | mlog(ML_BASTS, "lockres %s, requeue = %s.\n", lockres->l_name, |
d680efe9 | 4321 | ctl.requeue ? "yes" : "no"); |
ccd979bd MF |
4322 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
4323 | ||
d680efe9 MF |
4324 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
4325 | && lockres->l_ops->post_unlock) | |
4326 | lockres->l_ops->post_unlock(osb, lockres); | |
ccd979bd MF |
4327 | } |
4328 | ||
4329 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, | |
4330 | struct ocfs2_lock_res *lockres) | |
4331 | { | |
a75e9cca SE |
4332 | unsigned long flags; |
4333 | ||
ccd979bd MF |
4334 | assert_spin_locked(&lockres->l_lock); |
4335 | ||
4336 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { | |
4337 | /* Do not schedule a lock for downconvert when it's on | |
4338 | * the way to destruction - any nodes wanting access | |
4339 | * to the resource will get it soon. */ | |
9b915181 | 4340 | mlog(ML_BASTS, "lockres %s won't be scheduled: flags 0x%lx\n", |
ccd979bd MF |
4341 | lockres->l_name, lockres->l_flags); |
4342 | return; | |
4343 | } | |
4344 | ||
4345 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); | |
4346 | ||
a75e9cca | 4347 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
ccd979bd MF |
4348 | if (list_empty(&lockres->l_blocked_list)) { |
4349 | list_add_tail(&lockres->l_blocked_list, | |
4350 | &osb->blocked_lock_list); | |
4351 | osb->blocked_lock_count++; | |
4352 | } | |
a75e9cca | 4353 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
ccd979bd | 4354 | } |
34d024f8 MF |
4355 | |
4356 | static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb) | |
4357 | { | |
4358 | unsigned long processed; | |
a75e9cca | 4359 | unsigned long flags; |
34d024f8 MF |
4360 | struct ocfs2_lock_res *lockres; |
4361 | ||
a75e9cca | 4362 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4363 | /* grab this early so we know to try again if a state change and |
4364 | * wake happens part-way through our work */ | |
4365 | osb->dc_work_sequence = osb->dc_wake_sequence; | |
4366 | ||
4367 | processed = osb->blocked_lock_count; | |
209f7512 JQ |
4368 | /* |
4369 | * blocked lock processing in this loop might call iput which can | |
4370 | * remove items off osb->blocked_lock_list. Downconvert up to | |
4371 | * 'processed' number of locks, but stop short if we had some | |
4372 | * removed in ocfs2_mark_lockres_freeing when downconverting. | |
4373 | */ | |
4374 | while (processed && !list_empty(&osb->blocked_lock_list)) { | |
34d024f8 MF |
4375 | lockres = list_entry(osb->blocked_lock_list.next, |
4376 | struct ocfs2_lock_res, l_blocked_list); | |
4377 | list_del_init(&lockres->l_blocked_list); | |
4378 | osb->blocked_lock_count--; | |
a75e9cca | 4379 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4380 | |
4381 | BUG_ON(!processed); | |
4382 | processed--; | |
4383 | ||
4384 | ocfs2_process_blocked_lock(osb, lockres); | |
4385 | ||
a75e9cca | 4386 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 | 4387 | } |
a75e9cca | 4388 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4389 | } |
4390 | ||
4391 | static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb) | |
4392 | { | |
4393 | int empty = 0; | |
a75e9cca | 4394 | unsigned long flags; |
34d024f8 | 4395 | |
a75e9cca | 4396 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4397 | if (list_empty(&osb->blocked_lock_list)) |
4398 | empty = 1; | |
4399 | ||
a75e9cca | 4400 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4401 | return empty; |
4402 | } | |
4403 | ||
4404 | static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb) | |
4405 | { | |
4406 | int should_wake = 0; | |
a75e9cca | 4407 | unsigned long flags; |
34d024f8 | 4408 | |
a75e9cca | 4409 | spin_lock_irqsave(&osb->dc_task_lock, flags); |
34d024f8 MF |
4410 | if (osb->dc_work_sequence != osb->dc_wake_sequence) |
4411 | should_wake = 1; | |
a75e9cca | 4412 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4413 | |
4414 | return should_wake; | |
4415 | } | |
4416 | ||
200bfae3 | 4417 | static int ocfs2_downconvert_thread(void *arg) |
34d024f8 | 4418 | { |
34d024f8 MF |
4419 | struct ocfs2_super *osb = arg; |
4420 | ||
4421 | /* only quit once we've been asked to stop and there is no more | |
4422 | * work available */ | |
4423 | while (!(kthread_should_stop() && | |
4424 | ocfs2_downconvert_thread_lists_empty(osb))) { | |
4425 | ||
4426 | wait_event_interruptible(osb->dc_event, | |
4427 | ocfs2_downconvert_thread_should_wake(osb) || | |
4428 | kthread_should_stop()); | |
4429 | ||
4430 | mlog(0, "downconvert_thread: awoken\n"); | |
4431 | ||
4432 | ocfs2_downconvert_thread_do_work(osb); | |
4433 | } | |
4434 | ||
4435 | osb->dc_task = NULL; | |
4658d87c | 4436 | return 0; |
34d024f8 MF |
4437 | } |
4438 | ||
4439 | void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb) | |
4440 | { | |
a75e9cca SE |
4441 | unsigned long flags; |
4442 | ||
4443 | spin_lock_irqsave(&osb->dc_task_lock, flags); | |
34d024f8 MF |
4444 | /* make sure the voting thread gets a swipe at whatever changes |
4445 | * the caller may have made to the voting state */ | |
4446 | osb->dc_wake_sequence++; | |
a75e9cca | 4447 | spin_unlock_irqrestore(&osb->dc_task_lock, flags); |
34d024f8 MF |
4448 | wake_up(&osb->dc_event); |
4449 | } |